[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];

}

​

 

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