UIImage未显示

Question

I am using iOS 7 SDK and Xcode 5. I want to set icons on UITabBarItem. I am using below method.

setFinishedSelectedImage: withFinishedUnselectedImage:

It was working till now. But suddenly it stopped displaying images.

I tried below various options :

[img imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

[tabBarItem setSelectedImage:img];
[tabBarItem setImage:img];

[[UITabBarItem alloc] initWithTitle:title image:img selectedImage:img];

None of them is working. Here, img is the image downloaded from URL.

Then I tried with one of the images in app resource and it was displaying.

After that, I tried using temporary UIImageView with background color to red and set img to this UIImageView , it displayed red color instead of img .

But strange part is that I use the same img in other view controllers where it is displayed correctly.

Any idea how to solve this issue?

Answer 1

It was my mistake in code. I had to initialze img to some UIImage on declaration. Below is shown what was the issue.

UIImage * img;  // Image not initialized

// This condition was not satisfied and hence `img` was not storing any time.
if (condition)
{
    img = ...;
}

// Below condition should have been satisfied if `img` was not initialized.
// But it did not. I am not getting why.
if (!img)
{
    NSLog(@"Image is nil");
}

[tabBarItem setImage:img];