iOS 截屏

第一种

//截屏
- (UIImage *)ScreenCapture {
    //创建一个context
    //size画布的大小
    //opaque是否有透明度
    //scale画布的比率.
    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, self.view.opaque, 0.0);
    //把当前的全部画面导入到栈顶context中并进行渲染
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    //从当前context中创建一个新图片
    UIImage * tempImage = UIGraphicsGetImageFromCurrentImageContext();
    //是当前的context出堆栈
    UIGraphicsEndImageContext();
    return tempImage;
}

第二种

//截取任意位置,保存到相册
- (void)SaveScreenCaptureToPhoneAlbum {
    
    UIGraphicsBeginImageContextWithOptions(self.view.frame.size, NO, 0.0);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage * tempImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsGetCurrentContext();
    CGImageRef tempRef = tempImage.CGImage;
    //截图区域
    CGRect tempRect = CGRectMake(2*self.view.frame.origin.x, 2*self.view.frame.origin.y - 15, 2 * self.view.frame.size.width, 2 * self.view.frame.size.height);
    CGImageRef tempImageRef = CGImageCreateWithImageInRect(tempRef, tempRect);
    UIImage * sendImage = [[UIImage alloc] initWithCGImage:tempImageRef];
    //保存到相册
    UIImageWriteToSavedPhotosAlbum(sendImage, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}

//保存到相册
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    if (error == nil) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"已存入手机相册" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [alert show];
    }else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"提示" message:@"保存失败,你的设置里的隐私设置,可能拒绝了,XXXXX访问你的照片" delegate:self cancelButtonTitle:nil otherButtonTitles:@"确定", nil];
        [alert show];
    }
}