加载指示灯不能正常工作
加载指示灯不能正常工作
提问于 2016-08-04 20:02:58
这是我的代码。在传递数据和向数据库添加数据的过程中，当我单击按钮时，我想显示一个指示器。我怎么才能修复它？
@IBAction func addWishList(sender: AnyObject) {
self.loading.startAnimating()
addMovie(showMovie!) // Database add method.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { () -> Void in
let controller : WishListViewController = segue.destinationViewController as! WishListViewController
if segue.identifier == "segue" {
controller.user = self.tmpUser // data from Facebook to pass another controller
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.loading.stopAnimating()
})
}
})
}回答 2
Stack Overflow用户
回答已采纳
发布于 2016-08-04 20:29:31
您的addMovie阻塞主队列。你需要一些延迟才能将它添加到下一次运行循环中。尝试使用：
@IBAction func addWishList(sender: AnyObject) {
self.loading.startAnimating()
//This will add to next main run loop.
let dispatchTime: dispatch_time_t = dispatch_time(DISPATCH_TIME_NOW, Int64(0.0 * Double(NSEC_PER_SEC)))
dispatch_after(dispatchTime, dispatch_get_main_queue(), {
addMovie(showMovie!) // Database add method.
})
}Stack Overflow用户
发布于 2016-08-04 20:28:54
就像下面这样..
@IBAction func addWishList(sender: AnyObject) {
self.loading.startAnimating()
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), { () -> Void in
addMovie(showMovie!) // Database add method.
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.loading.stopAnimating()
})
})
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/38766808
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