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Blocksの記述パターン

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1.typedef (戻り値)(^ブロック型名)(引数)

typedef void(^Test)(NSString*);
Test test = ^void (NSString* str) {// リターンのvoidは省略可
    if(str) {
        NSLog(@"ON");
    }
    else {
        NSLog(@"OFF");
    }
}

typedefを使うとxcodeでコード補完ができない気がする。。。

2.プロパティでのBlock

@property(copy, nonatomic) void (^test)(NSString*);

3.引数でのBlock

-(void)blockTest:(void (^)(Test*)) testBlock {

}

4.戻り値でのBlock

-(void (^)(Test*))testBlock {
    void (^testBlock) (Test*) = ^(Test* test) {
        test.score = 100;
    };

    return testBlock;
};
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