UIImageView 再常见不过的东西了。。。
//创建
//创建的时候直接设置图片
let imageView = UIImageView(image:UIImage(named:"girl"))
//先创建出对象再设置图片
let imageView1 = UIImageView()
imageView1.image = UIImage(named:"girl")
//图片获取
1、从文件目录中获取图片
let path = Bundle.main.path(forResource:"girl", ofType: "png")
let newImage = UIImage(contentsOfFile: path!)
2、网络地址获取图片
let url = URL(string:"http://image.cnpp.cn/upload/images/20160905/09380421552_400x300.jpg")
let data = try! Data(contentsOf: url!)
let smallImage = UIImage(data: data)
//imageView1.image = smallImage
let imageView1 = UIImageView(image:smallImage)
//图片显示填充样式
imageView1.contentMode = UIViewContentMode.scaleAspectFit
对于UIImageView的图片填充样式有多种：
/*
public enum UIViewContentMode : Int {
case scaleToFill
case scaleAspectFit // contents scaled to fit with fixed aspect. remainder is transparent
case scaleAspectFill // contents scaled to fill with fixed aspect. some portion of content may be clipped.
case redraw // redraw on bounds change (calls -setNeedsDisplay)
case center // contents remain same size. positioned adjusted.
case top
case bottom
case left
case right
case topLeft
case topRight
case bottomLeft
case bottomRight
}
*/
//分组图片轮展
UIImageView中有设置多张图片一块展示的功能，类似于幻灯片的自动播放。其实现过程如下：
//设置图片数组
imageView1.animationImages = [UIImage(named:"2")!,UIImage(named:"3")!]
//所有图片展示完一遍的总时长
imageView1.animationDuration = 2
//开始
imageView1.startAnimating()
//结束
imageView1.stopAnimating()
//添加点击事件
UIImageView和UILabel类似，其用户交互默认关闭，我们要给其添加点击事件，需要打开其用户交互。
imageView1.isUserInteractionEnabled = true
let tapGestureRecognizer = UITapGestureRecognizer(target: self, action:#selector(ViewController.tapGestureRecognizer(sender:)))
imageView1.addGestureRecognizer(tapGestureRecognizer)
func tapGestureRecognizer(sender:UITapGestureRecognizer) {
//code
}
//属性设置
//边框设置
imageView.layer.borderColor = UIColor.redColor().CGColor
imageView.layer.borderWidth = 2
//圆角的设置
imageView.layer.cornerRadius = 150
imageView.layer.masksToBounds = true
UIImageView继承UIView，很多常见的属性在此就不列举。。
