iOS下截图代码

屏幕截图小代码，注意设置高宽和截图区域，非ARC下注意释放sendImage

    //截图
	UIGraphicsBeginImageContextWithOptions(CGSizeMake(640, 960), YES, 0);
	[self.layer renderInContext:UIGraphicsGetCurrentContext()];
	UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	CGImageRef imageRef = viewImage.CGImage;
	CGRect rect =CGRectMake(100, 100, 200, 300);//这里可以设置想要截图的区域
	CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect);
	UIImage *sendImage = [[UIImage alloc] initWithCGImage:imageRefRect];
	NSData *imageViewData = UIImagePNGRepresentation(sendImage);
	
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:@"result.png"];
    NSLog(@"%@", savedImagePath);
	[imageViewData writeToFile:savedImagePath atomically:YES];
	CGImageRelease(imageRefRect);