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July 9, 2015 09:53
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objc block syntax
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How Do I Declare A Block in Objective-C? | |
As a local variable: | |
returnType (^blockName)(parameterTypes) = ^returnType(parameters) {...}; | |
As a property: | |
@property (nonatomic, copy) returnType (^blockName)(parameterTypes); | |
As a method parameter: | |
- (void)someMethodThatTakesABlock:(returnType (^)(parameterTypes))blockName; | |
As an argument to a method call: | |
[someObject someMethodThatTakesABlock:^returnType (parameters) {...}]; | |
As a typedef: | |
typedef returnType (^TypeName)(parameterTypes); | |
TypeName blockName = ^returnType(parameters) {...}; | |
This site is not intended to be an exhaustive list of all possible uses of blocks. | |
If you find yourself needing syntax not listed here, it is likely that a typedef would make your code more readable. | |
Unable to access this site due to the profanity in the URL? http://goshdarnblocksyntax.com is a more work-friendly mirror. |
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