如何修复xcode警告UIActivityIndi​​catorView的xcode 4中的“表达式结果未使用”

Question

i am getting a warning for

    spinner.hidesWhenStopped;

warning : Expression result unused

hope any one know this
Thank you very much

Answer 1

Well hidesWhenStopped is a property of spinner and you don't do anything with it. Try setting a value as in

spinner.hidesWhenStopped = YES;

or

spinner.hidesWhenStopped = NO;

Answer 2

It seems you are trying to set the activity indicator to hide when stopped animating. The line spinner.hidesWhenStopped doesn't call the setter method. If you want to call the setter method you have to either use,

spinner.hidesWhenStopped = YES;

or,

[spinner setHidesWhenStopped:YES];