iOS 由masory之Block小记

回调block
-（void）changeValue:(void(^)())content;

返回Block
-（void(^)()）changeValuet;

函数式编程

TextBlock *test = [TextBlock new];
    
    void(^block)(NSString *str) = test.logString;
    block(@"dddd");
//上面两行等价于下面的一行
//    test.logString(@"66666");
    
    
    test.logVoid();

//链式编程思维
    test.logObj(@"1").logObj(@"2").logObj(@"3");
    NSLog(@"======================");

TextBlock.h

-(void(^)(NSString *string))logString;

-(void(^)(void))logVoid;

-(TextBlock *(^)(NSString *obj))logObj;

TextBlock.m

-(void(^)(NSString *string))logString{
    return ^(NSString *string){
        NSLog(@"%@",string);
    };
}

-(void(^)(void))logVoid{
    return ^(){
        NSLog(@"........");
    };
}

-(TextBlock *(^)(NSString *obj))logObj{
    return ^(NSString *obj){
        NSLog(@"返回对象的打印 %@",obj);
        return self;
    };
}