[置顶] ios 网页中图片点击放大效果demo

demo功能：点击网页中的图片，图片放大效果的demo。iphone6.1 测试通过。

demo说明：通过webview的委托事件shouldStartLoadWithRequest来实现。

demo截屏：

demo主要代码：

#pragma mark -
#pragma mark UIWebViewDelegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
    //将url转换为string
	NSString *picName = [[request URL] absoluteString];
	NSLog(@"picName is %@",picName);
    //hasPrefix 判断创建的字符串内容是否以pic:字符开始
	if ([picName hasPrefix:@"pic:"]) {
		[self showBigImage:[picName substringFromIndex:4]];
		return NO;
	}else {
		return YES;
	}
}
#pragma mark -
//显示大图片
-(void)showBigImage:(NSString *)imageName{
	//创建灰色透明背景，使其背后内容不可操作
	UIView *bgView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
	[bgView setBackgroundColor:[UIColor colorWithRed:0.3
											   green:0.3
												blue:0.3
											   alpha:0.7]];
	[self.view addSubview:bgView];
	[bgView release];

	//创建边框视图
	UIView *borderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, BIG_IMG_WIDTH+16, BIG_IMG_HEIGHT+16)];
	//将图层的边框设置为圆脚
    borderView.layer.cornerRadius = 8;
	borderView.layer.masksToBounds = YES;
    //给图层添加一个有色边框
	borderView.layer.borderWidth = 8;
	borderView.layer.borderColor = [[UIColor colorWithRed:0.9
													green:0.9
													 blue:0.9
													alpha:0.7] CGColor];
	[borderView setCenter:bgView.center];
	[bgView addSubview:borderView];
	[borderView release];

	//创建关闭按钮
	UIButton *closeBtn = [UIButton buttonWithType:UIButtonTypeCustom];
	[closeBtn setImage:[UIImage imageNamed:@"close.png"] forState:UIControlStateNormal];
	[closeBtn addTarget:self action:@selector(removeBigImage:) forControlEvents:UIControlEventTouchUpInside];
	NSLog(@"borderview is %@",borderView);
	[closeBtn setFrame:CGRectMake(borderView.frame.origin.x+borderView.frame.size.width-20, borderView.frame.origin.y-6, 26, 27)];
	[bgView addSubview:closeBtn];

	//创建显示图像视图
	UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(8, 8, BIG_IMG_WIDTH, BIG_IMG_HEIGHT)];
	[imgView setImage:[UIImage imageNamed:imageName]];
	[borderView addSubview:imgView];
	[imgView release];

}

demo下载地址：
http://download.csdn.net/download/donny_zhang/5679395