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) {...};
轉(zhuǎn)載來自http://fuckingblocksyntax.com/
