为什么UIViewContentModeScaleScaleAspectFit在UIScrollView内的UIImageView中不起作用？ 见所附图片

Question

I can't understand... it was used to work before in other Apps I made with older IOS framework

Check the code below:

If I changed the contentMode to Left it displays the image...

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UIScrollView* scrBook;
}

@property (nonatomic, retain) IBOutlet UIScrollView* scrBook;

@end



@synthesize scrBook;

- (void)viewDidLoad
{
    [super viewDidLoad];

    CGRect frame;
    frame.origin.x = 0;
    frame.origin.y = 0;
    frame.size = self.scrBook.frame.size;

    UIImageView *subview = [[UIImageView alloc] initWithFrame:frame];

    //subview.contentMode = UIViewContentModeLeft;
    subview.contentMode = UIViewContentModeScaleAspectFit;

    UIImage *currentImage = [UIImage alloc];
    currentImage = [UIImage imageNamed:@"model.jpg"];

    subview.image = currentImage;

    [self.scrBook addSubview:subview];

    self.scrBook.contentSize
    = CGSizeMake(self.scrBook.frame.size.width * 1, self.scrBook.frame.size.height);
}

UIViewContentModeLeft:

UIViewContentModeScaleAspectFit:

Updates: My last attempt was to uddate xcode to 4.5.2 and it doesn't work either, frustrating ...

Answer 1

Not the answer to your problem, just a few optimizations...

UIImage *currentImage = [UIImage alloc];
currentImage = [UIImage imageNamed:@"model.jpg"];

There is no need for the first line, just do this:

UIImage *currentImage = [UIImage imageNamed:@"model.jpg"];

Also,

self.scrBook.contentSize
= CGSizeMake(self.scrBook.frame.size.width * 1, self.scrBook.frame.size.height);

can just be...

self.scrBook.contentSize = self.srcBook.frame.size;

Answer 2

I found a solution but still don't know the reason, I upgraded my XCode to 4.5.1 to 4.5.2 and still nothing.

I duplicated one old project made in an older version of xcode (older than 4.5.1) using the 4.5.2 with the exaclty same code and it worked fine....

very weird.. I feel bad I took so many hours trying to find a solution...