如何使 UISegmentedControl 中的一个按钮文本跨越多行?
如何使 UISegmentedControl 中的一个按钮文本跨越多行?
使用UIAppearance来完成任务。以下代码片段将起作用。在创建您的段之前调用此代码。
Objective-C
[[UILabel appearanceWhenContainedIn:[UISegmentedControl class], nil] setNumberOfLines:0];
Swift
UILabel.appearanceWhenContainedInInstancesOfClasses([UISegmentedControl.self]).numberOfLines = 0
在iOS 4、5、6上运行得很顺畅。
在iOS 7上也可以运行(只需删除文本阴影)。
MultiLineSegmentedControl - 头文件
//
// MultiLineSegmentedControl.h
//
// Created by Jens Kreiensiek on 20.07.11.
// Copyright 2011 SoButz. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface MultiLineSegmentedControl : UISegmentedControl
- (void)setMultilineTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment;
@end
MultiLineSegmentedControl - 实现文件
//
// MultiLineSegmentedControl.m
//
// Created by Jens Kreiensiek on 20.07.11.
// Copyright 2011 SoButz. All rights reserved.
//
#import "MultiLineSegmentedControl.h"
#import "UIView+LayerShot.h"
@interface MultiLineSegmentedControl()
@property (nonatomic, retain) UILabel *theLabel;
@end
@implementation MultiLineSegmentedControl
@synthesize theLabel;
- (void)dealloc
{
self.theLabel = nil;
[super dealloc];
}
- (UILabel *)theLabel
{
if (!self->theLabel) {
self->theLabel = [[UILabel alloc] initWithFrame:CGRectZero];
self->theLabel.textColor = [UIColor whiteColor];
self->theLabel.backgroundColor = [UIColor clearColor];
self->theLabel.font = [UIFont boldSystemFontOfSize:13];
self->theLabel.textAlignment = UITextAlignmentCenter;
self->theLabel.lineBreakMode = UILineBreakModeWordWrap;
self->theLabel.shadowColor = [UIColor darkGrayColor];
self->theLabel.numberOfLines = 0;
}
return self->theLabel;
}
- (void)setMultilineTitle:(NSString *)title forSegmentAtIndex:(NSUInteger)segment
{
self.theLabel.text = title;
[self.theLabel sizeToFit];
[self setImage:self.theLabel.imageFromLayer forSegmentAtIndex:segment];
}
@end
UIView+LayerShot - 头文件
//
// UIView+LayerShot.h
//
// Created by Jens Kreiensiek on 29.06.12.
// Copyright (c) 2012 SoButz. All rights reserved.
//
#import <UIKit/UIKit.h>
@interface UIView (LayerShot)
- (UIImage *)imageFromLayer;
@end
UIView+LayerShot - 实现文件
//
// UIView+LayerShot.m
//
// Created by Jens Kreiensiek on 29.06.12.
// Copyright (c) 2012 SoButz. All rights reserved.
//
#import "UIView+LayerShot.h"
#import <QuartzCore/QuartzCore.h>
@implementation UIView (LayerShot)
- (UIImage *)imageFromLayer
{
UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0);
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
@end
使用它就像普通的UISegmentedControl一样:
...
MultiLineSegmentedControl *segment = [[MultiLineSegmentedControl alloc]
initWithItems:[NSArray arrayWithObjects:@"A", @"B", nil]];
segment.segmentedControlStyle = UISegmentedControlStyleBar;
segment.frame = CGRectMake(0, 0, 200, segment.frame.size.height * 1.5);
[segment setMultilineTitle:@"Title A\nSubtitle A" forSegmentAtIndex:0];
[segment setMultilineTitle:@"Title B\nSubtitle B" forSegmentAtIndex:1];
[self.view addSubview:segment];
[segment release];
...
基于Saranya Sivanandham的回答,Swift 3+语法。
UILabel.appearance(whenContainedInInstancesOf: [UISegmentedControl.self]).numberOfLines = 0
for(UIView *subview in segmentedControl.subviews) {
if([NSStringFromClass(subview.class) isEqualToString:@"UISegment"]) {
for(UIView *segmentSubview in subview.subviews) {
if([NSStringFromClass(segmentSubview.class) isEqualToString:@"UISegmentLabel"]) {
UILabel *label = (id)segmentSubview;
label.numberOfLines = 2;
label.text = @"Hello\nWorld";
CGRect frame = label.frame;
frame.size = label.superview.frame.size;
label.frame = frame;
}
}
}
}
for segment in segmented.subviews{
for label in segment.subviews{
if let labels = label as? UILabel{
labels.numberOfLines = 2
}
}
}
对于iOS 12,以下代码将完美运行
" [[UILabel appearanceWhenContainedInInstancesOfClasses:@[[UISegmentedControl class]]] setNumberOfLines:0];
我有一个带有UISegmentedControl的故事板,其中包含一些视图。我将这些控件拖到我的类中作为@IBOutlet
。以下是一些代码,用于使分段控件中的标签多行:
class MyViewController: UIViewController {
...
@IBOutlet weak var segmentedCtrl: UISegmentedControl!
{
didSet {
// localize strings
let text1 = ... // localizedString
...
segmentedCtrl.setTitle(text1, forSegmentAt: 0)
...
// Following code making multiple lines happen!
UILabel.appearance(whenContainedInInstancesOf:
[UISegmentedControl.self]).numberOfLines = 0
}
...
}