UISegmentedControl Class

UISegmentedControl Class Reference

Contents

UISegmentedControl Class Reference 4Overview 4

Customizing Appearance 5

Tasks 6

Initializing a Segmented Control 6

Managing Segment Content 6

Managing Segments 6

Managing Segment Behavior and Appearance 7

Customizing Appearance 7

Properties 8

apportionsSegmentWidthsByContent 8

momentary 8

numberOfSegments 9

segmentedControlStyle 9

selectedSegmentIndex 9

tintColor 10

Instance Methods 11

backgroundImageForState:barMetrics: 11

contentOffsetForSegmentAtIndex: 11

contentPositionAdjustmentForSegmentType:barMetrics: 12

dividerImageForLeftSegmentState:rightSegmentState:barMetrics: 13

imageForSegmentAtIndex: 13

initWithItems: 14

insertSegmentWithImage:atIndex:animated: 14

insertSegmentWithTitle:atIndex:animated: 15

isEnabledForSegmentAtIndex: 16

removeAllSegments 16

removeSegmentAtIndex:animated: 17

setBackgroundImage:forState:barMetrics: 17

setContentOffset:forSegmentAtIndex: 18

setContentPositionAdjustment:forSegmentType:barMetrics: 19

setDividerImage:forLeftSegmentState:rightSegmentState:barMetrics: 19

setEnabled:forSegmentAtIndex: 20

setImage:forSegmentAtIndex: 21

2011-10-12 | Copyright 2011 Apple Inc. All Rights Reserved.

2

setTitle:forSegmentAtIndex: 21

setTitleTextAttributes:forState: 22

setWidth:forSegmentAtIndex: 22

titleForSegmentAtIndex: 23

titleTextAttributesForState: 24

widthForSegmentAtIndex: 24

Constants 25

UISegmentedControlStyle 25

Segment Selection 26

UISegmentedControlSegment 26

Document Revision History 28


3

Contents

Inherits from UIControl : UIView : UIResponder : NSObject

Conforms to NSCoding

NSCoding (UIView)

UIAppearance (UIView)

UIAppearanceContainer (UIView)

NSObject (NSObject)

Framework /System/Library/Frameworks/UIKit.framework

Availability Available in iOS 2.0 and later.

Declared in UISegmentedControl.h

Related sample code iPhoneACFileConvertTest

iPhoneExtAudioFileConvertTest

NavBar

Quartz2D for iOS

UICatalog

OverviewA UISegmentedControl object is a horizontal control made of multiple segments, each segment functioning

as a discrete button. A segmented control affords a compact means to group together a number of controls.

A segmented control can display a title (an NSString object) or an image (UIImage object). The

UISegmentedControl object automatically resizes segments to fit proportionally within their superview

unless they have a specific width set. When you add and remove segments, you can request that the action

be animated with sliding and fading effects.

You register the target-action methods for a segmented control using the UIControlEventValueChanged

constant as shown below.

[segmentedControl addTarget:self


4

UISegmentedControl Class Reference

action:@selector(action:)

forControlEvents:UIControlEventValueChanged];

How you configure a segmented control can affect its display behavior:

If you set a segmented control to have a momentary style, a segment doesnt show itself as selected (blue

background) when the user touches it. The disclosure button is always momentary and doesnt affect the

actual selection.

In versions of iOS prior to 3.0, if a segmented control has only two segments, then it behaves like a

switchtapping the currently-selected segment causes the other segment to be selected. On iOS 3.0 and

later, tapping the currently-selected segment does not cause the other segment to be selected.

Customizing AppearanceIn iOS v5.0 and later, you can customize the appearance of segmented controls using the methods listed in

Customizing Appearance (page 7). You can customize the appearance of all segmented controls using the

appearance proxy (for example, [UISegmentedControl appearance]), or just of a single control.

When customizing appearance, in general, you should specify a value for the normal state of a property to be

used by other states which dont have a custom value set. Similarly, when a property is dependent on the bar

metrics (on the iPhone in landscape orientation, bars have a different height from standard), you should make

sure you specify a value for UIBarMetricsDefault.

In the case of the segmented control, appearance properties for UIBarMetricsLandscapePhone are only

respected for segmented controls in the smaller navigation and toolbars that are used in landscape orientation

on the iPhone.

To provide complete customization, you need to provide divider images for different state combinations, using

setDividerImage:forLeftSegmentState:rightSegmentState:barMetrics: (page 19):

// Image between two unselected segments.

[mySegmentedControl setDividerImage:image1 forLeftSegmentState:UIControlStateNormal

rightSegmentState:UIControlStateNormal barMetrics:barMetrics];

// Image between segment selected on the left and unselected on the right.

[mySegmentedControl setDividerImage:image1 forLeftSegmentState:UIControlStateSelected

rightSegmentState:UIControlStateNormal barMetrics:barMetrics];

// Image between segment selected on the right and unselected on the right.

[mySegmentedControl setDividerImage:image1 forLeftSegmentState:UIControlStateNormal

rightSegmentState:UIControlStateSelected barMetrics:barMetrics];

UISegmentedControl Class ReferenceOverview


5

Tasks

Initializing a Segmented Control

initWithItems: (page 14)

Initializes and returns a segmented control with segments having the given titles or images.

Managing Segment Content

setImage:forSegmentAtIndex: (page 21)

Sets the content of a segment to a given image.

imageForSegmentAtIndex: (page 13)

Returns the image for a specific segment

setTitle:forSegmentAtIndex: (page 21)

Sets the title of a segment.

titleForSegmentAtIndex: (page 23)

Returns the title of the specified segment.

Managing Segments

insertSegmentWithImage:atIndex:animated: (page 14)

Inserts a segment at a specified position in the receiver and gives it an image as content.

insertSegmentWithTitle:atIndex:animated: (page 15)

Inserts a segment at a specific position in the receiver and gives it a title as content.

numberOfSegments (page 9) property

Returns the number of segments the receiver has. (read-only)

removeAllSegments (page 16)

Removes all segments of the receiver

removeSegmentAtIndex:animated: (page 17)

Removes the specified segment from the receiver, optionally animating the transition.

selectedSegmentIndex (page 9) property

The index number identifying the selected segment (that is, the last segment touched).

UISegmentedControl Class ReferenceTasks


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Managing Segment Behavior and Appearance

momentary (page 8) property

A Boolean value that determines whether segments in the receiver show selected state.

segmentedControlStyle (page 9) property

The style of the segmented control.

setEnabled:forSegmentAtIndex: (page 20)

Enables the specified segment.

isEnabledForSegmentAtIndex: (page 16)

Returns whether the indicated segment is enabled.

setContentOffset:forSegmentAtIndex: (page 18)

Adjusts the offset for drawing the content (image or text) of the specified segment.

contentOffsetForSegmentAtIndex: (page 11)

Returns the offset for drawing the content (image or text) of the specified segment.

setWidth:forSegmentAtIndex: (page 22)

Sets the width of the specified segment of the receiver.

widthForSegmentAtIndex: (page 24)

Returns the width of the indicated segment of the receiver.

apportionsSegmentWidthsByContent (page 8) property

Indicates whether the control attempts to adjust segment widths based on their content widths.

Customizing Appearance

tintColor (page 10) property

The tint color of the segmented control.

backgroundImageForState:barMetrics: (page 11)

Returns the background image for a given state and bar metrics.

setBackgroundImage:forState:barMetrics: (page 17)

Sets the background image for a given state and bar metrics.

contentPositionAdjustmentForSegmentType:barMetrics: (page 12)

Returns the positioning offset for a given segment and bar metrics.

setContentPositionAdjustment:forSegmentType:barMetrics: (page 19)

Returns the content positioning offset for a given segment and bar metrics.

dividerImageForLeftSegmentState:rightSegmentState:barMetrics: (page 13)

Returns the divider image used for a given combination of left and right segment states and bar metrics.

UISegmentedControl Class ReferenceTasks


7

setDividerImage:forLeftSegmentState:rightSegmentState:barMetrics: (page 19)

Sets the divider image used for a given combination of left and right segment states and bar metrics.

titleTextAttributesForState: (page 24)

Returns the text attributes of the title for a given control state.

setTitleTextAttributes:forState: (page 22)

Sets the text attributes of the title for a given control state.

Properties

apportionsSegmentWidthsByContent

Indicates whether the control attempts to adjust segment widths based on their content widths.

@property(nonatomic) BOOL apportionsSegmentWidthsByContent

DiscussionIf the value of this property is YES, for segments whose width value is 0, the control attempts to adjust segment

widths based on their content widths.

The default is NO.

AvailabilityAvailable in iOS 5.0 and later.

Declared inUISegmentedControl.h

momentary

A Boolean value that determines whether segments in the receiver show selected state.

@property(nonatomic, getter=isMomentary) BOOL momentary

DiscussionThe default value of this property is NO. If it is set to YES, segments in the control do not show selected state

and do not update the value of selectedSegmentIndex (page 9) after tracking ends.


UISegmentedControl Class ReferenceProperties


8

Related Sample CodeNavBar


numberOfSegments

Returns the number of segments the receiver has. (read-only)

@property(nonatomic, readonly) NSUInteger numberOfSegments



segmentedControlStyle

The style of the segmented control.

@property(nonatomic) UISegmentedControlStyle segmentedControlStyle

DiscussionThe default style is UISegmentedControlStylePlain (page 25). See UISegmentedControlStyle (page 25)

for descriptions of valid constants.


Related Sample CodeGLPaintNavBarUICatalog


selectedSegmentIndex

The index number identifying the selected segment (that is, the last segment touched).



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@property(nonatomic) NSInteger selectedSegmentIndex

DiscussionThe default value is UISegmentedControlNoSegment (page 26) (no segment selected) until the user touches

a segment. Set this property to -1 to turn off the current selection. UISegmentedControl ignores this property

when the control is in momentary mode. When the user touches a segment to change the selection, the control

event UIControlEventValueChanged is generated; if the segmented control is set up to respond to this

control event, it sends a action message to its target.


See Also @property momentary (page 8)

Related Sample CodeiPhoneCoreDataRecipesNavBarQuartz2D for iOSState Restoration of Child View ControllersUICatalog


tintColor

The tint color of the segmented control.

@property(nonatomic, retain) UIColor *tintColor

DiscussionThe default value of this property is nil (no color). UISegmentedControl uses this property only if the style

of the segmented control is UISegmentedControlStyleBar (page 25).


Related Sample CodeGLPaintNavBarPVRTextureLoaderUICatalog



10


Instance Methods

backgroundImageForState:barMetrics:

Returns the background image for a given state and bar metrics.

- (UIImage *)backgroundImageForState:(UIControlState)statebarMetrics:(UIBarMetrics)barMetrics

Parametersstate

A control state.

barMetrics

Bar metrics.

Return ValueThe background image for state and barMetrics.

DiscussionFor more details, see setBackgroundImage:forState:barMetrics: (page 17).



contentOffsetForSegmentAtIndex:

Returns the offset for drawing the content (image or text) of the specified segment.

- (CGSize)contentOffsetForSegmentAtIndex:(NSUInteger)segment

Parameterssegment

An index number identifying a segment in the control. It must be a number between 0 and the number

of segments (numberOfSegments (page 9)) minus 1; values exceeding this upper range are pinned to

it.

UISegmentedControl Class ReferenceInstance Methods


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Return ValueThe offset (specified as a CGSize structure) from the origin of the segment at which to draw the segments

content.


See Also setContentOffset:forSegmentAtIndex: (page 18)


contentPositionAdjustmentForSegmentType:barMetrics:

Returns the positioning offset for a given segment and bar metrics.

-(UIOffset)contentPositionAdjustmentForSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlonebarMetrics:(UIBarMetrics)barMetrics

ParametersleftCenterRightOrAlone

An identifier for a segment.

barMetrics

Bar metrics.

Return ValueThe content positioning offset for the segment identified by leftCenterRightOrAlone and barMetrics.

DiscussionFor more details, see setContentPositionAdjustment:forSegmentType:barMetrics: (page 19).


See Also setContentPositionAdjustment:forSegmentType:barMetrics: (page 19)




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dividerImageForLeftSegmentState:rightSegmentState:barMetrics:

Returns the divider image used for a given combination of left and right segment states and bar metrics.

- (UIImage *)dividerImageForLeftSegmentState:(UIControlState)leftStaterightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics

ParametersleftState

The state of the left segment.

rightState

The state of the right segment.

barMetrics

Bar metrics.

Return ValueThe divider image used for the given combination of left and right segment states and bar metrics



imageForSegmentAtIndex:

Returns the image for a specific segment

- (UIImage *)imageForSegmentAtIndex:(NSUInteger)segment.

Parameterssegment



it.

Return ValueReturns the image assigned to the receiver as content. If no image has been set, it returns nil.




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See Also setImage:forSegmentAtIndex: (page 21)

Related Sample CodeUICatalog


initWithItems:

Initializes and returns a segmented control with segments having the given titles or images.

- (id)initWithItems:(NSArray *)items

Parametersitems

An array of NSString objects (for segment titles) or UIImage objects (for segment images).

Return ValueA UISegmentedControl object or nil if there was a problem in initializing the object.

DiscussionThe returned segmented control is automatically sized to fit its content within the width of its superview.



insertSegmentWithImage:atIndex:animated:

Inserts a segment at a specified position in the receiver and gives it an image as content.

- (void)insertSegmentWithImage:(UIImage *)image atIndex:(NSUInteger)segmentanimated:(BOOL)animated

Parametersimage

An image object to use as the content of the segment.



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segment

An index number identifying a segment in the control.

segment must be a number in the range 0 to the number of segments (numberOfSegments (page 9))

inclusive; values exceeding this upper range are pinned to it.

The new segment is inserted just before the designated one.

animated

YES if the insertion of the new segment should be animated, otherwise NO.


See Also insertSegmentWithTitle:atIndex:animated: (page 15) removeSegmentAtIndex:animated: (page 17)


insertSegmentWithTitle:atIndex:animated:

Inserts a segment at a specific position in the receiver and gives it a title as content.

- (void)insertSegmentWithTitle:(NSString *)title atIndex:(NSUInteger)segmentanimated:(BOOL)animated

Parameterstitle

A string to use as the segments title.

segment

An index number identifying a segment in the control.

segment must be a number in the range 0 to the number of segments (numberOfSegments (page 9))

inclusive; values exceeding this upper range are pinned to it.

The new segment is inserted just before the designated one.

animated

YES if the insertion of the new segment should be animated, otherwise NO.




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See Also insertSegmentWithImage:atIndex:animated: (page 14) removeSegmentAtIndex:animated: (page 17)


isEnabledForSegmentAtIndex:

Returns whether the indicated segment is enabled.

- (BOOL)isEnabledForSegmentAtIndex:(NSUInteger)segment

Parameterssegment



it.

Return ValueYES if the given segment is enabled and NO if the segment is disabled. By default, segments are enabled.


See Also setEnabled:forSegmentAtIndex: (page 20)


removeAllSegments

Removes all segments of the receiver

- (void)removeAllSegments


See Also removeSegmentAtIndex:animated: (page 17)



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removeSegmentAtIndex:animated:

Removes the specified segment from the receiver, optionally animating the transition.

- (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated

Parameterssegment



it.

animated

YES if the removal of the new segment should be animated, otherwise NO.


See Also removeAllSegments (page 16) insertSegmentWithImage:atIndex:animated: (page 14) insertSegmentWithTitle:atIndex:animated: (page 15)


setBackgroundImage:forState:barMetrics:

Sets the background image for a given state and bar metrics.

- (void)setBackgroundImage:(UIImage *)backgroundImage forState:(UIControlState)statebarMetrics:(UIBarMetrics)barMetrics

ParametersbackgroundImage

The background image to use for state and barMetrics.

state

A control state.



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barMetrics

Bar metrics.

DiscussionIf backgroundImage is an image returned from resizableImageWithCapInsets:, the cap widths are

calculated from that information.

If backgroundImage is not an image returned from resizableImageWithCapInsets:, the cap width is

calculated by subtracting one from the image's width then dividing by 2. The cap widths are used as the

margins for text placement. To adjust the margin, use the margin adjustment methods.

DiscussionFor more details, see backgroundImageForState:barMetrics: (page 11).




setContentOffset:forSegmentAtIndex:

Adjusts the offset for drawing the content (image or text) of the specified segment.

- (void)setContentOffset:(CGSize)offset forSegmentAtIndex:(NSUInteger)segment

Parametersoffset

The offset (specified as a CGSize type) from the origin of the segment at which to draw the segments

content. The default offset is (0,0).

segment



it.




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See Also contentOffsetForSegmentAtIndex: (page 11)


setContentPositionAdjustment:forSegmentType:barMetrics:

Returns the content positioning offset for a given segment and bar metrics.

- (void)setContentPositionAdjustment:(UIOffset)adjustmentforSegmentType:(UISegmentedControlSegment)leftCenterRightOrAlonebarMetrics:(UIBarMetrics)barMetrics

Parametersadjustment

The positioning offset for the segment identified by leftCenterRightOrAlone and barMetrics.

leftCenterRightOrAlone

An identifier for a segment type.

barMetrics

Bar metrics.

DiscussionYou use this method to adjust the position of a title or image within the given segment of a segmented control.


See Also contentPositionAdjustmentForSegmentType:barMetrics: (page 12)


setDividerImage:forLeftSegmentState:rightSegmentState:barMetrics:

Sets the divider image used for a given combination of left and right segment states and bar metrics.

- (void)setDividerImage:(UIImage *)dividerImageforLeftSegmentState:(UIControlState)leftStaterightSegmentState:(UIControlState)rightState barMetrics:(UIBarMetrics)barMetrics



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ParametersdividerImage

The divider image to use.

leftState

The state of the left segment.

rightState

The state of the right segment.

barMetrics

Bar metrics.




setEnabled:forSegmentAtIndex:

Enables the specified segment.

- (void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment

Parametersenabled

YES to enable the specified segment or NO to disable the segment. By default, segments are enabled.

segment



it.


See Also isEnabledForSegmentAtIndex: (page 16)




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setImage:forSegmentAtIndex:

Sets the content of a segment to a given image.

- (void)setImage:(UIImage *)image forSegmentAtIndex:(NSUInteger)segment

Parametersimage

An image object to display in the segment. .

segment



it.

DiscussionA segment can only have an image or a title; it cant have both. There is no default image.


See Also imageForSegmentAtIndex: (page 13)


setTitle:forSegmentAtIndex:

Sets the title of a segment.

- (void)setTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment

Parameterstitle

A string to display in the segment as its title.

segment



it.

DiscussionA segment can only have an image or a title; it cant have both. There is no default title.



21


See Also titleForSegmentAtIndex: (page 23)


setTitleTextAttributes:forState:

Sets the text attributes of the title for a given control state.

- (void)setTitleTextAttributes:(NSDictionary *)attributesforState:(UIControlState)state

Parametersattributes

The text attributes of the title for state.

state

A control state.

DiscussionThe attributes dictionary can specify the font, text color, text shadow color, and text shadow offset for the title

in the text attributes dictionary, using the keys in NSString UIKit Additions Reference .




setWidth:forSegmentAtIndex:

Sets the width of the specified segment of the receiver.

- (void)setWidth:(CGFloat)width forSegmentAtIndex:(NSUInteger)segment



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Parameterswidth

A float value specifying the width of the segment. The default value is {0.0}, which tells

UISegmentedControl to automatically size the segment.

segment



it.


See Also widthForSegmentAtIndex: (page 24)


titleForSegmentAtIndex:

Returns the title of the specified segment.

- (NSString *)titleForSegmentAtIndex:(NSUInteger)segment

Parameterssegment



it.

Return ValueReturns the string (title) assigned to the receiver as content. If no title has been set, it returns nil.


See Also setTitle:forSegmentAtIndex: (page 21)




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titleTextAttributesForState:

Returns the text attributes of the title for a given control state.

- (NSDictionary *)titleTextAttributesForState:(UIControlState)state

Parametersstate

A control state.

Return ValueThe text attributes of the title for state.

DiscussionFor more details, see setTitleTextAttributes:forState: (page 22)



widthForSegmentAtIndex:

Returns the width of the indicated segment of the receiver.

- (CGFloat)widthForSegmentAtIndex:(NSUInteger)segment

Parameterssegment



it.

Return ValueA float value specifying the width of the segment. If the value is {0.0}, UISegmentedControl automatically

sizes the segment.


See Also setWidth:forSegmentAtIndex: (page 22)



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Constants

UISegmentedControlStyle

The styles of the segmented control.

typedef enum {UISegmentedControlStylePlain,UISegmentedControlStyleBordered,UISegmentedControlStyleBar,UISegmentedControlStyleBezeled,

} UISegmentedControlStyle;

ConstantsUISegmentedControlStylePlain

The large plain style for segmented controls. This style is the default.

Available in iOS 2.0 and later.

Declared in UISegmentedControl.h.

UISegmentedControlStyleBordered

The large bordered style for segmented controls.



UISegmentedControlStyleBar

The small toolbar style for segmented controls. Segmented controls in this style can have a tint color (see

tintColor (page 10)).



UISegmentedControlStyleBezeled

The large bezeled style for segmented controls. Segmented controls in this style can have a tint color

(see tintColor (page 10)).



DiscussionYou use these constants as values for the segmentedControlStyle (page 9) property.

UISegmentedControl Class ReferenceConstants


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Segment Selection

A constant for indicating that no segment is selected.

enum {UISegmentedControlNoSegment = -1

};

ConstantsUISegmentedControlNoSegment

A segment index value indicating that there is no selected segment. See selectedSegmentIndex (page

9) for further information.



UISegmentedControlSegment

Constants for specifying a segment in a control

typedef enum {UISegmentedControlSegmentAny = 0,UISegmentedControlSegmentLeft = 1,UISegmentedControlSegmentCenter = 2,UISegmentedControlSegmentRight = 3,UISegmentedControlSegmentAlone = 4,

} UISegmentedControlSegment;

ConstantsUISegmentedControlSegmentAny

Specifies any segment.



UISegmentedControlSegmentLeft

The capped, leftmost segment.

Only applies when numSegments > 1.





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UISegmentedControlSegmentCenter

Any segment between the left and rightmost segments.




UISegmentedControlSegmentRight

The capped,rightmost segment. .




UISegmentedControlSegmentAlone

The standalone segment, capped on both ends.

Only applies when numSegments = 1.





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This table describes the changes to UISegmentedControl Class Reference .

NotesDate

Updated for iOS v5.0.2011-10-12

Added the UISegmentedControlStyleBezeled constant.2010-05-17

Fixed incorrect see also links.2010-03-23

Updated for iOS 3.0.2009-03-06

Corrected description of selectedSegmentIndex property.2008-09-30

New document that describes the class implementing horizontal controls

made of multiple segments, each segment functioning as a discrete button.

2008-06-10


28

Document Revision History

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UISegmentedControl Class ReferenceContentsUISegmentedControl Class ReferenceOverviewCustomizing Appearance

TasksInitializing a Segmented ControlManaging Segment ContentManaging SegmentsManaging Segment Behavior and AppearanceCustomizing Appearance

PropertiesapportionsSegmentWidthsByContentmomentarynumberOfSegmentssegmentedControlStyleselectedSegmentIndextintColor

Instance MethodsbackgroundImageForState:barMetrics:contentOffsetForSegmentAtIndex:contentPositionAdjustmentForSegmentType:barMetrics:dividerImageForLeftSegmentState:rightSegmentState:barMetrics:imageForSegmentAtIndex:initWithItems:insertSegmentWithImage:atIndex:animated:insertSegmentWithTitle:atIndex:animated:isEnabledForSegmentAtIndex:removeAllSegmentsremoveSegmentAtIndex:animated:setBackgroundImage:forState:barMetrics:setContentOffset:forSegmentAtIndex:setContentPositionAdjustment:forSegmentType:barMetrics:setDividerImage:forLeftSegmentState:rightSegmentState:barMetrics:setEnabled:forSegmentAtIndex:setImage:forSegmentAtIndex:setTitle:forSegmentAtIndex:setTitleTextAttributes:forState:setWidth:forSegmentAtIndex:titleForSegmentAtIndex:titleTextAttributesForState:widthForSegmentAtIndex:

ConstantsUISegmentedControlStyleSegment SelectionUISegmentedControlSegment

Revision History

UISegmentedControl Class

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