iOS 截屏图片

和之前的iOS 关于图片的操作类似，都是通过位图上下文操作的，言归正传.

1、开启位图上下文

//因为是截取整个屏幕，就不需要设置透明度，只需要设置尺寸大小。
UIGraphicsBeginImageContext(self.view.bounds.size);

2、将当前控制器的view渲染到位图上下文中

[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];

3、从位图上下文获取图片

 UIImage *captureImg = UIGraphicsGetImageFromCurrentImageContext();

4、结束位图编辑

 UIGraphicsEndImageContext();

5、保存到沙盒当中

    NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *path = [doc stringByAppendingPathComponent:@"capture.png"];
    NSLog(@"path %@", path);
    NSData *imageData = UIImagePNGRepresentation(captureImg);
    [imageData writeToFile:path atomically:YES];

6、为了测试查看可以存放到本地桌面

    NSData *imgData =UIImagePNGRepresentation(captureImg);
    [imgData writeToFile:@"/Users/apple/Desktop/capture.png" atomically:YES];

代码附上：

//开启位图上下文
    UIGraphicsBeginImageContext(self.view.bounds.size);
    
    //当前控制器的view渲染在位图上下文
    //render 渲染
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    //获取图片
    UIImage *captureImg = UIGraphicsGetImageFromCurrentImageContext();
    //结束位图
    UIGraphicsEndImageContext();
    //保存在沙盒当中
    NSString *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject];
    NSString *path = [doc stringByAppendingPathComponent:@"capture.png"];
    NSLog(@"path %@", path);
    NSData *imageData = UIImagePNGRepresentation(captureImg);
    [imageData writeToFile:path atomically:YES];
    //保存当前图片
    NSData *imgData =UIImagePNGRepresentation(captureImg);
    [imgData writeToFile:@"/Users/apple/Desktop/capture.png" atomically:YES];