IOS 成功失败的Block写法

来源：互联网发布：淘宝限制购物怎么解除编辑：程序博客网时间：2024/05/29 15:40

基本思路跟上篇一致。只是此处将成功与失败给封装起来了。这样做的好处在于，比如说用到百度地图定位，成功的话进成功的Block方法，失败的话进失败的Block方法。

代码如下：

A页面头文件（定义Block，初始化Block）：

- (void)launchSuccessBlock:(successBlock)successBlock launchFailure:(failBlock)failureBlock （成功与失败的集合方法）

typedef void(^successBlock)(NSString *showText);typedef void (^failBlock)();@interface CHAddressListViewController : CHBaseViewController@property (nonatomic,strong) successBlock testSuccessBlock;@property (nonatomic,strong) failBlock testFailBlock;//测试下block- (void)launchSuccessBlock:(successBlock)successBlock launchFailure:(failBlock)failureBlock;@end

A页面实现文件（传值给B页面）：

- (void)viewDidDisappear:(BOOL)animated{    [super viewDidDisappear:YES];    //即将消失的时候        if (self.returnTextBlock !=nil)    {        self.returnTextBlock(@"block 传值测试");                NSLog(@"======%@=======",self.returnTextBlock);    }        //此处简单的直接赋值，倘若在实际使用中，可以在百度地图的定位成功中调用    if (self.testSuccessBlock != nil)    {        self.testSuccessBlock(@"block 测试成功");    }        //可以在百度地图的定位失败中调用    if (self.testFailBlock != nil)    {        self.testFailBlock(@"block 测试失败");    }}//Block回调- (void)launchSuccessBlock:(successBlock)successBlock launchFailure:(failBlock)failureBlock{    self.testSuccessBlock = successBlock;    self.testFailBlock = failureBlock;}

B页面实现页面(获取从页面传过来的Block值)

@implementation secondViewController- (void)viewDidLoad{    [super viewDidLoad];        [self initContent];}- (void)initContent{    _label = [[UILabel alloc]initWithFrame:CGRectMake(100, 100, (kDEVICEWIDTH - 100), 30)];    _label.backgroundColor = [UIColor grayColor];    _label.textColor = [UIColor yellowColor];    [self.view addSubview:_label];            UIButton *_commitBtn = [[UIButton alloc]initWithFrame:CGRectMake(15, 179, kDEVICEWIDTH-30, 45)];    _commitBtn.backgroundColor = [UIColor grayColor];    [_commitBtn addTarget:self action:@selector(commitClick) forControlEvents:UIControlEventTouchUpInside];    [_commitBtn setTitle:@"提交" forState:UIControlStateNormal];    _commitBtn.titleLabel.textColor = [UIColor whiteColor];    _commitBtn.layer.cornerRadius = 4;    [self.view addSubview:_commitBtn];    _viewConTroller = [[CHAddressListViewController alloc] init];        [_viewConTroller returnText:^(NSString *showText)    {             CHDebugLog(@"---------%@------------",showText);             // self.secTextField.text = showText;                // _label.text = showText;    }];            [_viewConTroller launchSuccessBlock:^(NSString *showtext)     {         //CHDebugLog(@"---------Success Launch Block------------");         CHDebugLog(@"---------Block Success Value :%@------------",showtext);                  _label.text = showtext;     }    launchFailure:^{            CHDebugLog(@"---------fail Launch Block------------");    }];};

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