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? … Read more
objective-c
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 … Read more
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 … Read more
@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 … Read more
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 … Read more
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#>, … Read more
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 … Read more
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 … Read more
@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 … Read more
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 … Read more