导航项中的 UIButton 不响应单击答案

【问题标题】：UIButton in navigation item does not respond to click导航项中的 UIButton 不响应单击
【发布时间】：2015-11-19 09:09:30
【问题描述】：

我正在尝试向导航项添加三个按钮，我编写了以下代码：

let customNavigationItemView : UIView = UIView()
let trendbutton : UIButton = UIButton(type: .Custom)
size = myString.sizeWithAttributes([NSFontAttributeName: UIFont.systemFontOfSize(14.0)])
size.width = size.width * 1.5
nearbybutton.frame.size = size
...
let nearbybutton : UIButton = UIButton(type: .Custom)
...
let squarebutton : UIButton = UIButton(type: .Custom)
...
trendbutton.frame.origin = CGPointMake(-trendbutton.frame.size.width - nearbybutton.frame.size.width / 2, 0)
...
customNavigationItemView.addSubview(trendbutton)
customNavigationItemView.addSubview(nearbybutton)
customNavigationItemView.addSubview(squarebutton)
self.navigationItem.titleView = customNavigationItemView

trendbutton.addTarget(self, action:  "circleNavigationBar_trendButton_clickUp:", forControlEvents: .TouchUpInside)
nearbybutton.addTarget(self, action: "circleNavigationBar_nearbyButton_clickUp:", forControlEvents: .TouchUpInside)
squarebutton.addTarget(self, action: "circleNavigationBar_squareButton_clickUp:", forControlEvents: .TouchUpInside)

还有这个：

func circleNavigationBar_trendButton_clickUp(sender : UIButton) {
    print("trend click")
}

但是当我单击导航项中的按钮时，什么也不打印。谁能告诉我原因？还是谢谢大家。

【问题讨论】：

标签： uinavigationcontroller uinavigationbar swift2 uinavigationitem

【解决方案1】：

您必须将customNavigationItemView 的frame 设置为包含3 个按钮的大小。否则它的大小为零并且不会将触摸事件传递给它的子视图，因为它们发生在视图之外。

因此，如果您的按钮大小为 20 x 20 并且相互接触，这将起作用：

let customNavigationItemView : UIView = UIView()
customNavigationItemView.frame = CGRectMake(0, 0, 60, 20)

let trendbutton : UIButton = UIButton(type: .Custom)
trendbutton.frame = CGRectMake(0, 0, 20, 20)
...
let nearbybutton : UIButton = UIButton(type: .Custom)
nearbybutton.frame = CGRectMake(20, 0, 20, 20)
...
let squarebutton : UIButton = UIButton(type: .Custom)
squarebutton.frame = CGRectMake(40, 0, 20, 20)

【讨论】：

实际上我这样设置框架并更新了问题，但它不起作用。还是谢谢你们。

【解决方案2】：

我想也许我找到了答案，我像这样更改了我的代码：

trendbutton.frame = CGRectMake(0, 0, trendSize.width, trendSize.height)
nearbybutton.frame = CGRectMake(trendSize.width, 0, nearbySize.width, nearbySize.height)
squarebutton.frame = CGRectMake(trendSize.width + nearbySize.width, 0, squareSize.width, squareSize.height)
customNavigationItemView?.frame = CGRectMake(self.circleTable_tableView.frame.width / 2, 0, trendSize.width + nearbySize.width + squareSize.width, max(trendSize.height, nearbySize.height, squareSize.height))

现在效果很好，但我不明白这两种设置框架的方法之间的区别：一个是：

someView.frame = CGRectMake(0,0,10,10)

另一个是：

someView.frame.origin = CGPointMake(0,0) 
someView.frame.size = CGSizeMake(10,10)

【讨论】：