【IOS】自定义UIAlertView样式，实现可替换背景和按钮

原文链接：http://blog.csdn.net/toss156/article/details/7552075

      UIAlertView 是一个十分常用的控件，网上也有好多类似的自定义AlertView的方法。但是感觉效果都不是很好，它们有的是在系统自带的上面添加文本框，也有的是完全自己用UIView来实现，还有的就是继承了UIAlertView 。

      今天给大家带来的这个UIAlertView ，它也是继承了UIAlertView，然后屏蔽了系统的背景图片，和 按钮，然后自己添加，事件响应，从而完成了样式的自定义，这样做的好处是保留了 UIAlertView的模态窗口。

 

最终的效果图：

////  JKCustomAlert.m//  AlertTest////  Created by  on 12-5-9.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import <UIKit/UIKit.h>@protocol JKCustomAlertDelegate <NSObject>@optional- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex;@end@interface JKCustomAlert : UIAlertView {    id  JKdelegate;UIImage *backgroundImage;    UIImage *contentImage;    NSMutableArray *_buttonArrays;}@property(readwrite, retain) UIImage *backgroundImage;@property(readwrite, retain) UIImage *contentImage;@property(nonatomic, assign) id JKdelegate;- (id)initWithImage:(UIImage *)image contentImage:(UIImage *)content;-(void) addButtonWithUIButton:(UIButton *) btn;@end

////  //  JKCustomAlert.m//  AlertTest////  Created by  on 12-5-9.//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.//#import "JKCustomAlert.h"@interface JKCustomAlert ()    @property(nonatomic, retain) NSMutableArray *_buttonArrays;@end@implementation JKCustomAlert@synthesize backgroundImage,contentImage,_buttonArrays,JKdelegate;- (id)initWithImage:(UIImage *)image contentImage:(UIImage *)content{    if (self == [super init]) {        self.backgroundImage = image;        self.contentImage = content;        self._buttonArrays = [NSMutableArray arrayWithCapacity:4];    }    return self;}-(void) addButtonWithUIButton:(UIButton *) btn{    [_buttonArrays addObject:btn];}- (void)drawRect:(CGRect)rect {CGSize imageSize = self.backgroundImage.size;[self.backgroundImage drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];    }- (void) layoutSubviews {    //屏蔽系统的ImageView 和 UIButton    for (UIView *v in [self subviews]) {        if ([v class] == [UIImageView class]){            [v setHidden:YES];        }                        if ([v isKindOfClass:[UIButton class]] ||            [v isKindOfClass:NSClassFromString(@"UIThreePartButton")]) {            [v setHidden:YES];        }    }        for (int i=0;i<[_buttonArrays count]; i++) {        UIButton *btn = [_buttonArrays objectAtIndex:i];        btn.tag = i;        [self addSubview:btn];        [btn addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];    }    if (contentImage) {        UIImageView *contentview = [[UIImageView alloc] initWithImage:self.contentImage];        contentview.frame = CGRectMake(0, 0, backgroundImage.size.width, backgroundImage.size.height);        [self addSubview:contentview];    }}-(void) buttonClicked:(id)sender{    UIButton *btn = (UIButton *) sender;        if (JKdelegate) {        if ([JKdelegate respondsToSelector:@selector(alertView:clickedButtonAtIndex:)])        {            [JKdelegate alertView:self clickedButtonAtIndex:btn.tag];        }    }        [self dismissWithClickedButtonIndex:0 animated:YES];}- (void) show {        [super show];        CGSize imageSize = self.backgroundImage.size;        self.bounds = CGRectMake(0, 0, imageSize.width, imageSize.height);        }- (void)dealloc {    [_buttonArrays removeAllObjects];    [backgroundImage release];    if (contentImage) {        [contentImage release];        contentImage = nil;    }       [super dealloc];}@end

Demo下载地址：http://download.csdn.net/detail/toss156/4289966