UIImage的使用¶

读取图片¶

1.从应用资源包读取图片¶

1	let image = UIImage(named: "imageName.jpg") //imageName.jpg：图片的名称

2.从网络读取图片¶

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 let url = NSURL(string:"http://www.crazyit.org/logo.jpg")
 let data = NSData(contentsOfURL:url)!
 let image = UIImage(data:data)

3.从手机本地读取图片¶

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 func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {      
        var image = info[UIImagePickerControllerOriginalImage] as! UIImage
    }

CGImage,可以对图片进行编辑，如缩放，旋转等功能¶

1.UIImage和CGImage的相互转换¶

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 let cgImage = image.CGImage   //UIImage转CGImage

 let image = UIImage(CGImage: cgImage)  //CGImage转UIImage