请告诉我如何在导航栏下添加ProgressView? 我试着在这篇文章中使用解决方案:adding progress bar under navigation bar,但是代码是用ObjectiveC语言写的......我试着翻译成Swift。这是我在NavigationController SubClass
中添加的代码import UIKit
class CustomNavigationController: UINavigationController {
@IBOutlet var Secondprogress: UIProgressView!
override func viewDidLoad() {
super.viewDidLoad()
NSLayoutConstraint.deactivateConstraints(self.view.constraints())
Secondprogress?.setTranslatesAutoresizingMaskIntoConstraints(false)
var navBar = self.navigationController?.navigationBar
Secondprogress.tag = 1
self.view.addSubview(Secondprogress)
var Constraint = NSLayoutConstraint(item: self.Secondprogress,
attribute:NSLayoutAttribute.Bottom,
relatedBy:NSLayoutRelation.Equal,
toItem:navBar,
attribute:NSLayoutAttribute.Bottom,
multiplier:1.0,
constant:-0.5);
self.view.addConstraint(Constraint);
Constraint = NSLayoutConstraint(item: self.Secondprogress,
attribute:NSLayoutAttribute.Left,
relatedBy:NSLayoutRelation.Equal,
toItem:navBar,
attribute:NSLayoutAttribute.Left,
multiplier:1.0,
constant:0);
self.view.addConstraint(Constraint);
Constraint = NSLayoutConstraint(item: self.Secondprogress,
attribute:NSLayoutAttribute.Right,
relatedBy:NSLayoutRelation.Equal,
toItem:navBar,
attribute:NSLayoutAttribute.Right,
multiplier:1.0,
constant:0);
self.view.addConstraint(Constraint);
Secondprogress.setTranslatesAutoresizingMaskIntoConstraints(false)
Secondprogress.hidden = false
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
但是当我编译我的应用程序时,我没有在导航栏下看到ProgressView。
我的错误在哪里?
答案 0 :(得分:9)
我的问题已经解决了。
编写代码:
override func viewDidLoad() {
super.viewDidLoad()
var navBar = self.navigationController?.navigationBar
var navBarHeight = navBar?.frame.height
var ProgressFrame = self.Progress.frame
var pSetX = ProgressFrame.origin.x
var pSetY = CGFloat(navBarHeight!)
var pSetWidth = self.view.frame.width
var pSetHight = ProgressFrame.height
Progress.frame = CGRectMake(pSetX, pSetY, pSetWidth, pSetHight)
self.navigationController?.navigationBar.addSubview(Progress)
Progress.setTranslatesAutoresizingMaskIntoConstraints(false)
}
4.Success!
答案 1 :(得分:2)
查看http://www.appcoda.com/webkit-framework-intro/ - 在"显示进度"一部分。
它是用Swift编写的,但它们使用界面构建器来创建约束。