【无限互联】iOS开发block用法之UIAlertView控件的修改

原始的UIAlertView的需要通过委托方法来实现按钮点击事件，需要设置代理，实现委托方法，比较繁琐。我们可以自定义一个UIAlertView类，通过block语法替代委托代理，这样的话，使用该自定义的UIAlertView就比较方便了。

 

BlockUIAlertView.h 文件

 

typedef void(^AlertBlock)(NSInteger);

@interface BlockUIAlertView : UIAlertView

@property(nonatomic,copy)AlertBlock block;

- (id)initWithTitle:(NSString *)title
            message:(NSString *)message
  cancelButtonTitle:(NSString *)cancelButtonTitle
        clickButton:(AlertBlock)_block
  otherButtonTitles:(NSString *)otherButtonTitles;

@end

 

BlockUIAlertView.m 文件的实现

 

#import "BlockUIAlertView.h"

@implementation BlockUIAlertView

@synthesize block;

- (id)initWithTitle:(NSString *)title
            message:(NSString *)message
  cancelButtonTitle:(NSString *)cancelButtonTitle
        clickButton:(AlertBlock)_block
  otherButtonTitles:(NSString *)otherButtonTitles {

    self = [super initWithTitle:title message:message delegate:self cancelButtonTitle:cancelButtonTitle otherButtonTitles:otherButtonTitles,nil];

    if (self) {
        self.block = _block;
    }

    return self;
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    self.block(buttonIndex);
}


@end

 

该自定义的BlockUIAlertView的调用

 

BlockUIAlertView *alertView = [[BlockUIAlertView alloc] initWithTitle:@"提示" message:@"block测试" cancelButtonTitle:@"取消title" clickButton:^(NSInteger indexButton){
    NSLog(@"%d",indexButton);
} otherButtonTitles:nil];
[alertView show];

 

 

评论

1 楼 一席青菜 2014-07-20  

好写法，但block执行结束要只为nil