Question

How can I save and load the UIButton’s alpha values in my iPhone app? I want to do this the easiest way possible. I have tried using various methods, but none have worked for me so far.

Answer 1

Try this:

CGFloat alpha = myButton.layer.opacity;

You might need to #import <QuartzCore/QuartzCore.h>.

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Edit (From this SO Question):

Then, you can simply store it in NSUserDefaults:

[[NSUserDefaults standardUserDefaults] setObject:myButton.backgroundColor forKey:@"buttonColor"];
[[NSUserDefaults standardUserDefaults] synchronize];  // Thanks @Shah for reminding us about this!

Then retrieve it like such:

myButton.backgroundColor = [[NSUserDefaults standardUserDefaults] objectForKey:@"buttonColor"];

And when you’re done with it:

[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"buttonColor"];

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NSUserDefaults Class Reference