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";