我想在Swift中以编程方式创建UIProgressBar?
这段代码有什么问题吗?
override func viewDidLoad() {
super.viewDidLoad()
let progressView = UIProgressView(progressViewStyle: .Bar)
progressView.center = self.view.center
progressView.frame = CGRectMake(0,0,50,20)
progressView.translatesAutoresizingMaskIntoConstraints = false
progressView.setProgress(0.5, animated: false)
self.view.addSubview(progressView)
}
translatesAutoresizingMaskIntoConstraints = false
,但是却没有添加任何约束。只需要添加约束来指定你想要的位置即可。如果你查看视图调试器,我敢打赌这个视图不在你预期的位置上... - Rob