常用的分类

转换坐标系

图像截屏

- (UIImage *)screenShotOfView:(UIView *)view

{

UIGraphicsBeginImageContextWithOptions(self.imageView.frame.size, YES, 0.0);

[self.imageView drawViewHierarchyInRect:self.imageView.frame afterScreenUpdates:NO];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return image;

}

水印

- (UIImage *)addlogoImage:(UIImage *)resizedImage

{

UIGraphicsBeginImageContext(resizedImage.size);

[resizedImage drawInRect:CGRectMake(0, 0, resizedImage.size.width, resizedImage.size.height)];

UIImage *maskImage  = [UIImage imageNamed:@"dzh_logo.png"];

[maskImage drawInRect:CGRectMake((resizedImage.size.width - maskImage.size.width)/2,

(resizedImage.size.height - maskImage.size.height)/2,

maskImage.size.width,

maskImage.size.height)];

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return resultingImage;

}