自定义UIAlertView样式，实现可替换背景和按钮

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：



[cpp] view
plaincopy

//

// 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

[cpp] view
plaincopy

//

//

// 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