How Do I Declare A Block in Objective-C?
As alocal variable:
returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...};
As aproperty:
@property (nonatomic, copy, nullability) returnType (^blockName)(parameterTypes);
As amethod parameter:
- (void)someMethodThatTakesABlock:(returnType (^nullability)(parameterTypes))blockName;
As anargument to a method call:
[someObject someMethodThatTakesABlock:^returnType (parameters) {...}];
As aparameter to a C function:
void SomeFunctionThatTakesABlock(returnType (^blockName)(parameterTypes));
As atypedef:
typedef returnType (^TypeName)(parameterTypes);
TypeName blockName = ^returnType(parameters) {...};
