Scrollview cannot display content

Create a scrollview and add an imageview to it. The main code for creating an imageView is as follows:

@ Interface ImagePageView: UIView

@ Property (nonatomic, retain) UIImageView * imageViewOne;

@ Property (nonatomic, retain) UIImageView * imageViewTwo;

-(Void) imageViewV :( int) pageNum;

-(Void) imageViewH :( int) pageNum;

 

 

@ Implementation ImagePageView

 

@ Synthesize imageViewOne = _ imageViewOne;

@ Synthesize imageViewTwo = _ imageViewTwo;

-(UIImageView *) imageViewOne

{

If (! _ ImageViewOne ){

_ ImageViewOne = [[UIImageView alloc] init];

[Self addSubview: _ imageViewOne];

}

Return _ imageViewOne;

}

 

-(UIImageView *) imageViewTwo

{

If (! _ ImageViewTwo ){

_ ImageViewTwo = [[UIImageView alloc] init];

[Self addSubview: _ imageViewTwo];

}

Return _ imageViewTwo;

}

 

-(Void) imageViewV :( int) pageNum

{

_ ImageViewOne. image = [[[UIImage alloc] initWithContentsOfFile: [[NSBundle mainBundle] pathForResource: [array objectAtIndex: pageNum] ofType: nil] autorelease];

_ ImageViewOne. frame = self. bounds;

}

The result cannot be displayed. Soon I found the problem. The red part should be changed:

Self. imageViewOne. image = [[[UIImage alloc] initWithContentsOfFile: [[NSBundle mainBundle] pathForResource: [array objectAtIndex: pageNum] ofType: nil] autorelease];

Self. imageViewOne. frame = self. bounds;

The reason is that the red code does not call the initialization code (-(UIImageView *) imageViewTwo/-(UIImageView *) imageViewOne). Therefore, imageViewOne is nil and the image cannot be displayed.

Self. imageViewOne calls the get method.