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IOS Technical Test MCQs

Which of the following will create a singleton class that is compatible with ARC?

+ (MyClass *)sharedInstance { static MyClass *sharedInstance = nil; static dispatch_once_t onceToken; dispatch_once(&onceToken, ^{ sharedInstance = [[MyClass alloc] init]; }); return sharedInstance; }

+ (id)sharedInstance { static MyClass *sharedInstance = nil; @synchronized(self) { if(sharedInstance == nil) sharedInstance = [[super allocWithZone:NULL] init]; } return sharedInstance; }

+ (MyClass *)sharedClass { static MyClass *sharedInstance = nil; @synchronized(self) { static dispatch_once_t onceToken; } dispatch_once(&onceToken, ^{ sharedInstance = [[MyClass alloc] init]; }); return sharedInstance; }

It is not possible to create a singleton class in Objective-C.

its MCQS-MA TYPE

Answer

Correct Answer: its MCQS-MA TYPE

Explanation:

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