iphone - IOS UIImageView displays with black background -

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So I've got this function is that measures UIImages , and I am using it I have to start to be a .png with a UIImageView full transparency My problem is that when the image is displayed, a black rectangular image background the always around with an image Regardless, it is.

It is as well as the scaling method the initialisation UIImageView : 

  - (UIImage *) imageWithImage: (UIImage *) image scaledToSize: (CGSize) newSize {if ([[UIScreen mainScreen] respondsToSelector: @selector (scale)]) {if ([[UIScreen mainScreen] scale] == 2.0) {UIGraphicsBeginImageContextWithOptions (newSize, yes, 2.0); } And {UIGraphicsBeginImageContext (newSize); }} And {UIGraphicsBeginImageContext (newSize); } [Image drawInRect: CGRectMake (0, 0, newSize.width, newSize.height)]; UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext (); UIGraphicsEndImageContext (); New image refund; } - (void) addMass: (M *) mass {UIImageView * image = [[UIImageView alloc] initWithImage: [self imageWithImage: [UIImage imageNamed: @ "circle.png"] scaledToSize: CGSizeMake (mass.mass, mass .mass)]]; [Image setbackgram color: [[UIColor alloc] initWithRed: 0 green: 0 blue: 0 alpha: 1]]; Image. Center = [group status]; [Image setbackgram color: [UIColor clearColor]]; [MUST IMAGES ADOBECT: IMAGE]; [Self.view addSubview: image]; }

You can see I've used [Image setBackgroundColor: [UIColor clearColor]]; to try and set the background color of to clear UIImageView , but it is not working.

All you need to do is 

  UIGRIFIIGIJEJentTechWidth Option (new Size, no, 0);

and the scale factor will be set automatically, and the resulting pixel in the image will be transparent.


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