iOS开发--UISwitch用法

原文地址为：http://blog.sina.com.cn/s/blog_4cd8dd130100to3x.html

1.UISwitch的初始化

1	UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectMake(4.0f, 16.0f, 100.0f, 28.0f)];

2.设置UISwitch的初始化状态

1	switchView.on = YES ; //设置初始为ON的一边

3.UISwitch事件的响应

1	[switchView addTarget: self action: @selector (switchAction:) forControlEvents:UIControlEventValueChanged];

-(void) switchAction:(id)sender

{

UISwitch * switch = （UISwitch *）sender;

}

另个版本：

.h文件中声明：

UISwitch * leftSwitch;

@property (nonatomic , retain) IBOutlet UISwitch
* leftSwitch;

.m文件中添加：

@synthesize leftSwitch;

viewDidUnload()中添加：

leftSwitch = nil;

dealloc()中添加：

[leftSwitch release];

显示：

leftSwitch.hidden = NO;

隐藏：

leftSwitch.hidden = YES;

通过IBAction方法设置开关

-(IBAction) switchChanged:(id)sender

{

UISwitch * whichSwitch = (UISwitch *)sender;

BOOL setting = whichSwitch.isOn;

[leftSwitch setOn:setting animated:YES];

[rightSwitch setOn:setting animated:YES];

}

iphone
自定义UISwitch

修改UISwitch的标题，实现自定义UISwitch方法有两种：

1.使用类别扩展UISwitch。

如下：

下面是UISwitch.h文件：

#import <UIKit/UIKit.h>

@interface UISwitch (tagged)

+ (UISwitch *) switchWithLeftText: (NSString *) tag1
andRight: (NSString *) tag2;

@property (nonatomic, readonly) UILabel
*label1;

@property (nonatomic, readonly) UILabel
*label2;

@end

UISwitch.m文件：

#import "UISwitch-Extended.h"

#define TAG_OFFSET 900

@implementation UISwitch (tagged)

- (void) spelunkAndTag: (UIView *) aView withCount:(int *)
count

{

for (UIView *subview in [aView subviews])

{

if ([subview isKindOfClass:[UILabel class]])

{

*count += 1;

[subview setTag:(TAG_OFFSET +
*count)];

}

else

[self spelunkAndTag:subview withCount:count];

}

}

- (UILabel *) label1

{

return (UILabel *)
[self viewWithTag:TAG_OFFSET + 1];

}

- (UILabel *) label2

{

return (UILabel *) [self viewWithTag:TAG_OFFSET + 2];

}

+ (UISwitch *) switchWithLeftText: (NSString *) tag1
andRight: (NSString *) tag2

{

UISwitch *switchView = [[UISwitch alloc] initWithFrame:CGRectZero];

int labelCount = 0;

[switchView spelunkAndTag:switchView withCount:&labelCount];

if (labelCount == 2)

{

[switchView.label1 setText:tag1];

[switchView.label2 setText:tag2];

}

return [switchView autorelease];

}

@end

2.还有一种方法，这种方法比较简单，但比较难懂，我不甚理解。

UISwitch *isFooOrBar=[[UISwitch alloc] init];

((UILabel *)[[[[[[isFooOrBar subviews] lastObject] subviews] objectAtIndex:2] subviews]objectAtIndex:0]).text = @"Foo";

((UILabel *)[[[[[[isFooOrBar subviews] lastObject] subviews] objectAtIndex:2] subviews]objectAtIndex:1]).text = @"Bar";