按下iOS swift后更改UIBarButtonItem图标

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
}

答

创建方法，根据 self.isFavourited 的状态更新Button >

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

按下iOS swift后更改UIBarButtonItem图标

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