我有两种方法。我想在完成第一个任务后执行一个。我怎样才能做到这一点?
问问题
1200 次
2 回答
7
我假设您正在寻找简单的完成块解决方案,所以这应该足够了。
-(void)method1:(void (^ __nullable)(void))completion {
NSLog(@"method1 started");
//Do some stuff, then completion
completion();
NSLog(@"method1 ended");
}
-(void)method2{
NSLog(@"method2 called");
}
像这样使用,
- (void)viewDidLoad{
[super viewDidLoad];
[self method1:^{ //After method1 completion, method2 will be called
[self method2];
}];
}
于 2017-01-05T11:51:48.167 回答
1
你可以做类似的事情,
[[manager POST:url parameters:parameters success:^(NSURLSessionDataTask * _Nonnull task, id _Nonnull responseObject) {
NSLog(@"This is success!!!");
//this is first method's completion blcok!
// this is another method from completion of first
[self saveImages:^(BOOL isDone) {
// this is second method's completion
}];
} failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) {
NSLog(@"failure : Error is : %@",error.localizedDescription);
// this is completion of first method but with failure
}]resume];
这是如何管理它的简单示例!在这我使用了AFNEtworking的方法,所以不要混淆它!
于 2017-01-05T11:33:28.443 回答