iOS Block浅析

// 定义一个Block Object，返回值：NSString；别名：intToString；参数：NSUInteger。

NSString* (^intToString)(NSUInteger) = ^(NSUInteger paramInteger){

    NSString *result = [NSString stringWithFormat:@"%lu",(unsignedlong)paramInteger];

    return result;

};

// 调用我们定义的Block Ojbect

NSString *string = intToString(10);

NSLog(@"string = %@", string);

typedef NSString* (^IntToStringConverter)(NSUInteger paramInteger);

- (NSString *)convertIntToString:(NSUInteger)paramInteger usingBlockObject:(IntToStringConverter)paramBlockObject{

    return paramBlockObject(paramInteger);

}

 NSString *result = [self convertIntToString:123 usingBlockObject:intToString];

    NSLog(@"result = %@", result);

typedef NSString* (^IntToStringConverter)(NSUInteger paramInteger);

- (NSString *)convertIntToString:(NSUInteger)paramInteger usingBlockObject:(IntToStringConverter)paramBlockObject{

    return paramBlockObject(paramInteger);

}

- (void) doTheConversion{

    IntToStringConverter inlineConverter = ^(NSUInteger paramInteger){

        NSString *result = [NSString stringWithFormat:@"%lu", (unsignedlong)paramInteger];

        return result;

    };

    

    NSString *result = [self convertIntToString:123usingBlockObject:inlineConverter];

    NSLog(@"result = %@", result);

    

}