objective-c Archives - Page 10 of 11

How to add percent sign to NSString

I want to have a percentage sign in my string after a digit. Something like this: 75%. How can I have this done? ...

May 5, 2022
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What does the “__block” keyword mean?

What exactly does the __block keyword in Objective-C mean? I know it allows you to modify variables within blocks, but I’d like to ...

May 5, 2022
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Creating an abstract class in Objective-C

I’m originally a Java programmer who now works with Objective-C. I’d like to create an abstract class, but that doesn’t appear to be ...

May 3, 2022
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@synthesize vs @dynamic, what are the differences?

What are the differences between implementing a @property with @dynamic or @synthesize? 8 s 8 @synthesize will generate getter and setter methods for ...

May 1, 2022
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In Objective-C, how do I test the object type?

I need to test whether the object is of type NSString or UIImageView. How can I accomplish this? Is there some type of ...

May 1, 2022
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dispatch_after – GCD in Swift?

I’ve gone through the iBook from Apple, and couldn’t find any definition of it: Can someone explain the structure of dispatch_after? dispatch_after(<#when: dispatch_time_t#>, ...

April 30, 2022
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How to convert an NSString into an NSNumber

How can I convert a NSString containing a number of any primitive data type (e.g. int, float, char, unsigned int, etc.)? The problem ...

April 30, 2022
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Location Services not working in iOS 8

My app that worked fine on iOS 7 doesn’t work with the iOS 8 SDK. CLLocationManager doesn’t return a location, and I don’t see my ...

April 29, 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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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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