一、简单说明

在程序开发中,有时候需要截取屏幕上的某一块内容,比如捕鱼达人游戏。如图:

【iOS】Quartz2D截屏

完成截屏功能的核心代码:- (void)renderInContext:(CGContextRef)ctx;调用某个view的layer的renderInContext:方法即可

 

二、代码示例

  storyboard界面搭建:

【iOS】Quartz2D截屏

 1 - (IBAction)BtnClick:(UIButton *)sender {
 2     
 3     //延迟两秒保存
 4     dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
 5         //获取图形上下文
 6         //    UIGraphicsBeginImageContext(self.view.frame.size);
 7         UIGraphicsBeginImageContext(self.contentView.frame.size);
 8         //将view绘制到图形上下文中
 9         
10         //    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
11         [self.contentView.layer renderInContext:UIGraphicsGetCurrentContext()];
12      
13         
14         //将截屏保存到相册
15         UIImage *newImage=UIGraphicsGetImageFromCurrentImageContext();
16         
17         UIImageWriteToSavedPhotosAlbum(newImage,self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
18     });
19 }
20 
21  - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo
22 {
23     if (error) {
24         [MBProgressHUD showError:@"保存失败,请检查是否拥有相关的权限"];
25     }else
26     {
27 //        [MBProgressHUD showMessage:@"保存成功!"];
28         [MBProgressHUD showSuccess:@"保存成功!"];
29     }
30 }
View Code

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