objective-c Archives - Page 26 of 28

Send and receive messages through NSNotificationCenter in Objective-C?

I am attempting to send and receive messages through NSNotificationCenter in Objective-C. However, I haven’t been able to find any examples on how ...

April 29, 2022
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What does the NS prefix mean?

Many classes in Cocoa/Cocoa Touch have the NS prefix. What does it mean? 9 s 9 It’s from the NeXTSTEP heritage.

April 29, 2022
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iOS 8 UITableView separator inset 0 not working

I have an app where the UITableView‘s separator inset is set to custom values – Right 0, Left 0. This works perfectly in ...

April 28, 2022
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How do I test if a string is empty in Objective-C?

How do I test if an NSString is empty in Objective-C? 3Best Answer 31

April 28, 2022
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@class vs. #import

It is to my understanding that one should use a forward-class declaration in the event ClassA needs to include a ClassB header, and ...

April 26, 2022
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Placeholder in UITextView

My application uses an UITextView. Now I want the UITextView to have a placeholder similar to the one you can set for an ...

April 24, 2022
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How to link to apps on the app store

I am creating a free version of my iPhone game. I want to have a button inside the free version that takes people ...

April 24, 2022
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Generating random numbers in Objective-C

I’m a Java head mainly, and I want a way to generate a pseudo-random number between 0 and 74. In Java I would ...

April 24, 2022
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How do I create delegates in Objective-C?

I know how delegates work, and I know how I can use them. But how do I create them? 19 s 19 An ...

April 22, 2022
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How do you trigger a block after a delay, like -performSelector:withObject:afterDelay:?

Is there a way to call a block with a primitive parameter after a delay, like using performSelector:withObject:afterDelay: but with an argument like ...

April 22, 2022
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