1,使用图像控件显示图片
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var imageView= UIImageView (image: UIImage (named: "icon" ))
imageView.frame= CGRectMake (10,10,100,100)
self .view.addSubview(imageView)
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2,改变图片
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imageView.image= UIImage (named: "icon2" )
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3,从文件目录中获取图片
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let path = NSBundle .mainBundle().pathForResource( "apple" , ofType: "png" )
var newImage = UIImage (contentsOfFile: path!)
var imageView = UIImageView (image:newImage)
self .view.addSubview(imageView)
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4,从网络地址获取图片
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//定义NSURL对象 //从网络获取数据流 var data = NSData (contentsOfURL: url!)
//通过数据流初始化图片 var newImage = UIImage (data: data!)
var imageView = UIImageView (image:newImage);
self .view.addSubview(imageView)
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5,使用图像控件实现动画播放
UIImageView中提供了存储多张图片来创建动画的功能,具体做法是,在animationImages属性中设置一个图片数组,然后使用
startAnimating方法开始动画,最后用stopAnimating方法停止动画。同时,使用animationDuration属性中可以设
置动画每帧切换的速度(秒)。
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class ViewController : UIViewController {
var imageView: UIImageView !
override func viewDidLoad() {
super .viewDidLoad()
imageView= UIImageView ()
imageView.frame= CGRectMake (10,10,100,100)
//设置动画图片
imageView.animationImages=[ UIImage (named: "icon" )!, UIImage (named: "icon2" )!] as [ AnyObject ]
//设置每隔0.5秒变化一次
imageView.animationDuration=0.5
self .view.addSubview(imageView)
}
override func viewWillAppear(animated: Bool ) {
super .viewWillAppear(animated)
imageView.startAnimating()
}
override func viewWillDisappear(animated: Bool ) {
super .viewWillAppear(animated)
imageView.stopAnimating()
}
} |