Question

I’m new to Xcode. This is probably a very simple question to you, but I wonder if anyone can help me.

What I want to do is to load an image in a customised UIImageView, when clicking the image, the imageview will change to another image. When I run the simulator, there are no error messages, but the second image does not load after clicking.

I’ve declared a UIImageView subclass dragView. In the dragView.m, I have such codes:

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 
{
[self changePicture];
}

-(void) changePicture {
  NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"Red Flower.png"];
  self.image = [UIImage imageWithContentsOfFile:path];    
}

By the way, I have enabled the interaction. Many thanks!

Answer 1

You probably need to tell the OS to update the view by calling [self setNeedsDisplay:YES].