UIImagePickerController不加载图像

Question

This seems like a relatively simple issue but it has me stumped. Any help / insight is appreciated.

Problem:

I have a UIImagePickerController button on my screen and would like to initially load with a custom image until the user selects an image from the camera roll (the custom image is just a + sign). However the UIImagePickerController button appears blank until the user clicks it for the first time. After the first click, it works fine but for some reason it does not initialize with the default image. I have pasted my code from viewDidLoad method in the controller.

Code :

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);  
NSString *documentsPath = [paths objectAtIndex:0];
NSString *filePath = [documentsPath stringByAppendingPathComponent:[self.detailItem cardName]];
filePath = [filePath stringByAppendingPathExtension:@"png"];
NSData *pngData = [NSData dataWithContentsOfFile:filePath];
imgPickerButton.imageView.image = [UIImage imageWithData:pngData];

So what am I doing wrong? Any insight is appreciated and thanks in advance for your help.

Answer 1

Debug it?

//Your Code

//Debug it with muscle
NSLog(@"\n**** I Love Debug Statements! *****\ndocumentsPath: %@\n filePath: %@\ndetailItem: %@\ndefault image: %@", documentsPath, filePath, self.detailItem, imgPickerButton.imageView.image);

My guess is that your "self.detailItem" is nil when you try to call this the first time...

Answer 2

from the picture it looks like this is a part of a tableview? If this is the case then the tableview cell is getting loaded before your above code is

Answer 3

Ok figured it out!! I was setting the image for the UIButton in the viewDidLoad method. Which is a method called after the view is drawn. Hence the default image was not appearing until the first click, at which time the UIButton is redrawn. To solve this issue I moved the code to awakeFromNib method and voila!! it works fine. The default image loads smoothly...