/**
按指定尺寸缩放图片
@param image 原始图片
@param size 缩放尺寸
@return 缩放后的图片
*/
+ (UIImage *)originImage:(UIImage *)image scaleToSize:(CGSize)size {
UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
[image drawInRect:CGRectMake(0.f, 0.f, size.width, size.height)];
UIImage *scaleImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return scaleImage;
}
/**
根据屏幕的宽高等比压缩图片
@param originImage 原始图片
@return 缩放后的图片
*/
+ (UIImage *)compressImage:(UIImage *)originImage {
CGSize size = originImage.size;
CGFloat scale = 1.f;
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
if (size.width > screenSize.width || size.height > screenSize.height) {
if (size.width > size.height) {
scale = screenSize.width / size.width;
} else {
scale = screenSize.height / size.height;
}
}
CGSize scaleSize = CGSizeMake(size.width * scale, size.height * scale);
UIGraphicsBeginImageContext(screenSize);
[originImage drawInRect:CGRectMake(0.f, 0.f, scaleSize.width, scaleSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
