有没有更好的方法通过单击按钮来更改 ImageView 中的图像?
Is there a better way to change an Image in an ImageView by clicking a button?
目前我正在通过执行以下操作更改图像视图:
@IBOutlet var bgImage: UIImageView!
创建在故事板中连接的 UIimage 视图
和
var counter = 0
@IBAction func ChangePic(){
//print(counter)
if(counter == 15){
counter = 0
}
let image: UIImage = UIImage(named: String(counter))!
bgImage = UIImageView(image: image)
bgImage.image = UIImage(named: String(counter))
self.view.addSubview(bgImage!)
counter = counter + 1
}
在这里修改imageview,这个函数连接到故事板中的一个按钮,所以当你点击它时它会改变图片。有一个计数器的原因是因为照片是从 0-14 中列举出来的,所以我可以很容易地显示它们。这很好用,但图像会自行调整大小并不断出现在彼此之上
由于您已经有了 imageView bgImage,您所要做的就是在 bgImage 上设置图像 属性。您不需要每次都创建一个新的 imageView。
@IBAction func ChangePic(){
if(counter == 15){
counter = 0
}
bgImage.image = UIImage(named: String(counter))
counter = counter + 1
}
如果您只想更改图片,只需执行以下操作:
@IBAction func ChangePic(){
//print(counter)
if(counter == 15){
counter = 0
}
bgImage.image = UIImage(named: String(counter))
counter = counter + 1
}
您当前的代码:
@IBAction func ChangePic(){
//print(counter)
if(counter == 15){
counter = 0
}
// You create new image
let image: UIImage = UIImage(named: String(counter))!
// You set new instance to your imageView with your updated image (No need to do this because the object is not nil)
bgImage = UIImageView(image: image)
// You set again your updated image (only this line required )
bgImage.image = UIImage(named: String(counter))
// No needed
self.view.addSubview(bgImage!)
counter = counter + 1
}
目前我正在通过执行以下操作更改图像视图:
@IBOutlet var bgImage: UIImageView!
创建在故事板中连接的 UIimage 视图 和
var counter = 0
@IBAction func ChangePic(){
//print(counter)
if(counter == 15){
counter = 0
}
let image: UIImage = UIImage(named: String(counter))!
bgImage = UIImageView(image: image)
bgImage.image = UIImage(named: String(counter))
self.view.addSubview(bgImage!)
counter = counter + 1
}
在这里修改imageview,这个函数连接到故事板中的一个按钮,所以当你点击它时它会改变图片。有一个计数器的原因是因为照片是从 0-14 中列举出来的,所以我可以很容易地显示它们。这很好用,但图像会自行调整大小并不断出现在彼此之上
由于您已经有了 imageView bgImage,您所要做的就是在 bgImage 上设置图像 属性。您不需要每次都创建一个新的 imageView。
@IBAction func ChangePic(){
if(counter == 15){
counter = 0
}
bgImage.image = UIImage(named: String(counter))
counter = counter + 1
}
如果您只想更改图片,只需执行以下操作:
@IBAction func ChangePic(){
//print(counter)
if(counter == 15){
counter = 0
}
bgImage.image = UIImage(named: String(counter))
counter = counter + 1
}
您当前的代码:
@IBAction func ChangePic(){
//print(counter)
if(counter == 15){
counter = 0
}
// You create new image
let image: UIImage = UIImage(named: String(counter))!
// You set new instance to your imageView with your updated image (No need to do this because the object is not nil)
bgImage = UIImageView(image: image)
// You set again your updated image (only this line required )
bgImage.image = UIImage(named: String(counter))
// No needed
self.view.addSubview(bgImage!)
counter = counter + 1
}