Created a method to resize UIImage.When I write the process of taking out the elements of the image array and resizing them one by one, the memory does not open well, and if high-definition images are resized many times, the memory will run out.If I want to write the following code in an ARC environment, how should I free up memory?
"It seems that ""trimmedImage"" has not been opened, so please let me know if there is any way to forcefully open the trimmedImage."(*I tried using @autoreleasepool and trimmedImage=nil; but it didn't open until the next loop, so I only used more memory.)
+ (void) cropImages: (NSArray*) images {
for(__weak UIImage* image in images) {
UIImage*reservedImage=[selfcropRectImage:image];
}
}
+ (UIImage*) cropRectImage: (UIImage*) image{
float = image.size.width;
float = image.size.height;
CGRect;
if(h<=w){
float x = w/2 - h/2;
floaty = 0;
rect = CGRectMake(x,y,h,h);
} else {
float x = 0;
floaty = h/2 - w/2;
rect = CGRectMake(x,y,w,w);
}
CGIMAGERef cgImage=CGIMAGECreateWithImageInRect(image.CGIMAGE, rect);
UIImage* trimmedImage= [UIImage imageWithCGImage:cgImage];
CGSize newSize = CGSizeMake (320,320);
UIGraphicsBeginImageContext (newSize);
UIImage*reservedImage=nil;
trimmedImage drawInRect: CGRectMake(0,0, newSize.width, newSize.height);
// TODO: It should be AutoReleased here... (http://vladimir.zardina.org/2010/05/resizing-uiimage-objects/)
resizedImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
image=nil;
cgImage=nil;
return resizedImage;
}
The reason is CGImageRef release failure as already resolved in the comment.
In this case, I draw with two hands, trimming and resizing, but the image size for trimming is large, plus CGImageRef, so I have to explicitly release it. If you set origin in the negative direction during resizing, it will be easy.
+ (UIImage*) cropRectImage: (UIImage*) image{
CGFlow=image.size.width, h=image.size.height;
float scale=(h<w)?320/h:320/w;
CGSize size = CGSizeMake (w*scale, h*scale);
UIGraphicsBeginImageContext (CGSizeMake (320,320));
image drawInRect: CGRectMake(320-size.width)/2, (320-size.height)/2, size.width, size.height);
UIImage*reservedImage=UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resizedImage;
}
© 2024 OneMinuteCode. All rights reserved.