按下iOS swift后更改UIBarButtonItem图标 [英] Change UIBarButtonItem Icon after pressed iOS swift
本文介绍了按下iOS swift后更改UIBarButtonItem图标的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在 viewDidload
方法中,我宣布了一个按钮并设置了RightBarButton ......
In the viewDidload
method, I've declared a button and set RightBarButton...
let btnFavourite = UIButton(frame: CGRectMake(0,0,30,30))
btnFavourite.addTarget(self, action: "btnFavourite:", forControlEvents: .TouchUpInside)
btnFavourite.setImage(UIImage(named: "star"), forState: .Normal)
btnFavourite.setImage(UIImage(named: "star_filled"), forState: .Highlighted)
let rightButton = UIBarButtonItem(customView: btnFavourite)
self.navigationItem.setRightBarButtonItems([rightButton], animated: true)
如何从图像'star.png'按下按钮然后更改为'star_filled.png'?然后按'star_filled.png'中的按钮到'star.png'?
How do I pressed the button from image 'star.png' then change to 'star_filled.png'? and press the button from 'star_filled.png' to 'star.png'?
如何制作两个函数,如
func btnFavourite()
{
//clicked the favourite button then image change to star_filled.png
}
fun btnUnfavourite()
{
//clicked the button then the bar button image change to star.png
}
推荐答案
创建方法,根据 self.isFavourited
var isFavourited = false;//declare this above the viewDidload()
func updateRighBarButton(isFavourite : Bool){
let btnFavourite = UIButton(frame: CGRectMake(0,0,30,30))
btnFavourite.addTarget(self, action: "btnFavouriteDidTap", forControlEvents: .TouchUpInside)
if isFavourite {
btnFavourite.setImage(UIImage(named: "star_filled"), forState: .Normal)
}else{
btnFavourite.setImage(UIImage(named: "star"), forState: .Normal)
}
let rightButton = UIBarButtonItem(customView: btnFavourite)
self.navigationItem.setRightBarButtonItems([rightButton], animated: true)
}
func btnFavouriteDidTap()
{
//do your stuff
self.isFavourited = !self.isFavourited;
if self.isFavourited {
self.favourite();
}else{
self.unfavourite();
}
self.updateRighBarButton(self.isFavourited);
}
func favourite()
{
//do your favourite stuff/logic
}
func unfavourite(){
//do your unfavourite logic
}
在viewDidload方法中,第一次调用,即
In the viewDidload method, call first time, i.e.
self.updateRighBarButton(self.isFavourited);//first time self.isFavourited will be false
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