IOS 成功失败的Block写法

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------------");
}];
};