iOS截图

-(void)touchesEnded:(NSSet *)touches
withEvent:(UIEvent *)event

{

//    1.开始图形上下文

CGSize imageSize = self.view.bounds.size;

UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0.0);

//2.将某个view的所有内容渲染到图形上下文中

CGContextRef  contextRef = UIGraphicsGetCurrentContext();

[self.view.layer renderInContext:contextRef];

//3.取的图片

UIImage * image = UIGraphicsGetImageFromCurrentImageContext();

CGImageRef subImage = CGImageCreateWithImageInRect(image.CGImage, CGRectMake(0, 0, self.view.bounds.size.width * 0.9, self.view.bounds.size.height));

UIImage * newImage = [UIImage imageWithCGImage:subImage];

//写入本地文件

[UIImagePNGRepresentation(newImage) writeToFile:@"/Users/Lenny/Desktop/view.png"  atomically:YES];

//结束图形上下文

UIGraphicsEndImageContext();

}