iOS开发:创建独立的警告视图

UIAlertView 的基本用法就不再说了，如果我们向用户提供了选项，并且需要这些选项，可以通过实现协议里的方法。我们通过以下两个方法判断选择：

1，硬编码的方式对按钮的索引做比较，或用switch语句。

2，通过-buttonTitleAtIndex方法，比较字符串。

如果警告视图较多，那就不只是判断是那个按钮被按下，而是那个警告视图的那个按钮了。

我们使用Block能让这个过程更加漂亮。

XYAlertView.h：

#import <UIKit/UIKit.h>   
    typedef void(^XYAlertBlock)(void); 
    @interface XYAlertView : UIAlertView<UIAlertViewDelegate>{ 
    } 
    + (void)showWithTitle:(NSString *)title 
                  message:(NSString *)message 
              buttonTitle:(NSString *)buttonTitle; 
    + (void)showWithTitle:(NSString *)title 
                  message:(NSString *)message 
              cancelTitle:(NSString *)cancelTitle 
              cancelBlock:(XYAlertBlock)cancelBlock 
               otherTitle:(NSString *)otherTitle 
               otherBlock:(XYAlertBlock)otherBlock; 
    @end 

XYAlertView.m：

#import "XYAlertView.h"   
    @interface XYAlertView () 
    @property (nonatomic, copy) XYAlertBlock cancelBlock; 
    @property (nonatomic, copy) XYAlertBlock otherBlock; 
    @property (nonatomic, copy) NSString *cancelButtonTitle; 
    @property (nonatomic, copy) NSString *otherButtonTitle; 
    - (id)initWithTitle:(NSString *)title 
                message:(NSString *)message 
            cancelTitle:(NSString *)cancelTitle 
             ancelBlock:(XYAlertBlock)cancelBolck 
             otherTitle:(NSString *)otherTitle 
             otherBlock:(XYAlertBlock)otherBlock; 
    @implementation XYAlertView 
    @synthesize cancelBlock = _cancelBlock; 
    @synthesize otherBlock = _otherBlock; 
    @synthesize cancelButtonTitle = _cancelButtonTitle; 
    @synthesize otherButtonTitle = _otherButtonTitle; 
    + (void)showWithTitle:(NSString *)title message:(NSString *)message buttonTitle:(NSString *)buttonTitle{ 
        [self showWithTitle:title message:message cancelTitle:buttonTitle cancelBlock:nil otherTitle:nil otherBlock:nil]; 
    } 
    + (void)showWithTitle:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle cancelBlock:(XYAlertBlock)cancelBlock otherTitle:(NSString *)otherTitle otherBlock:(XYAlertBlock)otherBlock{ 
        [[[self alloc] initWithTitle:title message:message cancelTitle:cancelTitle ancelBlock:cancelBlock otherTitle:otherTitle otherBlock:otherBlock] show]; 
    } 
    - (id)initWithTitle:(NSString *)title message:(NSString *)message cancelTitle:(NSString *)cancelTitle ancelBlock:(XYAlertBlock)cancelBolck otherTitle:(NSString *)otherTitle otherBlock:(XYAlertBlock)otherBlock{ 
        if ((self = [super initWithTitle:title message:message delegate:self cancelButtonTitle:cancelTitle otherButtonTitles:otherTitle, nil])) { 
            if (cancelBolck == nil && otherBlock == nil) { 
                self.delegate = nil; 
            } 
            self.cancelButtonTitle = cancelTitle; 
            self.otherButtonTitle = otherTitle; 
            self.cancelBlock = cancelBolck; 
            self.otherBlock = otherBlock; 
        } 
        return self; 
    } 
    #pragma mark - 
    #pragma mark UIAlertViewDelegate 
    - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{ 
        NSString *buttonTitle = [alertView buttonTitleAtIndex:buttonIndex]; 
        if ([buttonTitle isEqualToString:self.cancelButtonTitle]) { 
            if (self.cancelBlock) { 
                self.cancelBlock(); 
            } 
        }else if ([buttonTitle isEqualToString:self.otherButtonTitle]){ 
            if (self.otherBlock) { 
                self.otherBlock(); 
            } 
        } 
    } 
    @end 

源代码下载：http://down.51cto.com/data/835995