OC——Block 声明方法

最新推荐文章于 2025-02-24 17:47:20 发布

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最新推荐文章于 2025-02-24 17:47:20 发布

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分类专栏： OC知识点

本文链接：https://blog.youkuaiyun.com/xinshou_caizhu/article/details/52101678

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本文介绍了一种使用 Objective-C 中的块(Block)来遍历和操作不同集合类型的方法，包括字符串、数组、字典和集合等，并通过具体的代码示例展示了如何实现这些操作。

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//.h文件
+ (void)bloStr:(NSString *)str block:(void (^)(NSString *newStr))block;

+ (void)bloStr1:(NSString *)str block:(void (^)(char ch))block;

+ (void)bloArr:(NSArray *)arr block:(void (^)(id obj, NSInteger index))block;

+ (void)bloDict:(NSDictionary *)dict block:(void (^)(id key))block;

+ (void)bloSet:(NSSet *)set block:(void (^)(id obj))block;


//.m文件
+ (void)bloStr:(NSString *)str block:(void (^)(NSString *))block {
    
    NSString *str1 = @"";
    
    for (int i = 0; i < str.length; i++) {
        
        char ch = [str characterAtIndex:i];
        
        str1 = [NSString stringWithFormat:@"%c%@", ch, str1];
        
    }
    
    block(str1);
    
}

+ (void)bloStr1:(NSString *)str block:(void (^)(char))block {
    
    for (int i = 0; i < str.length; i++) {
        
        block([str characterAtIndex:i]);
        
    }
    
}

+ (void)bloArr:(NSArray *)arr block:(void (^)(id, NSInteger))block {
    
    for (NSInteger i = 0; i < arr.count; i++) {
        
        block(arr[i], i);
        
    }
    
}

+ (void)bloDict:(NSDictionary *)dict block:(void (^)(id))block {
    
    for (id key in dict.allKeys) {
        
        block(key);
        
    }
    
}

+ (void)bloSet:(NSSet *)set block:(void (^)(id))block {
    
    for (id obj in set) {
        
        block(obj);
        
    }
    
}


//main函数
        // 翻转字符串
        [Bus bloStr:@"123456" block:^(NSString *newStr) {
            
            NSLog(@"%@", newStr);
            
        }];
        
        // 字符串
        [Bus bloStr1:@"123qweasd56" block:^(char ch) {
           
            NSLog(@"%c", ch);
            
        }];
        
        // 数组
        NSArray *arr = @[@"sd", @234, @"sd", @"dfg", @56];
        
        [Bus bloArr:arr block:^(id obj, NSInteger index) {
           
            NSLog(@"值：%@, 下标：%ld", obj, index);
            
        }];
        
        // 字典
        NSDictionary *dic = @{@"sd":@234, @"d":@"dfd", @234:@"ty123", @"345":@"rui3ui"};
        
        [Bus bloDict:dic block:^(id key) {
           
            NSLog(@"key:%@, value:%@", key, dic[key]);
            
        }];
        
        // 集
        
        NSSet *set = [NSSet setWithObjects:@"sad", @"32", @"df", @[@23, @"fg"], @123, @"ui", nil];
        
        [Bus bloSet:set block:^(id obj) {
           
            NSLog(@"%@", obj);
            
        }];