如何等待多个方法完成？
这是 objective-c 的解决方案:
self.dispatch_group = dispatch_group_create();
dispatch_group_notify(self.dispatch_group, dispatch_get_main_queue(), ^{
});
dispatch_group_leave(strongSelf.dispatch_group);
最佳答案
在 Swift 3 中...
let dispatchGroup = DispatchGroup()
dispatchGroup.enter()
dispatchGroup.leave()
dispatchGroup.notify(queue: DispatchQueue.main) {...}
https://developer.apple.com/reference/dispatch/dispatchgroup
关于objective-c - 什么是 dispatch_group_create 的 Swift 等价物，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24272558/