//判断camera是否可用
UIImagePickerController.isCameraDeviceAvailable(.Front)
//判断某个数据方式是否可用
UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType)
// 裁剪图片
Vc.allowsEditing = true
// 打开相册
func selectImage(){
let pickerVc = UIImagePickerController()
// 设置代理
pickerVc.delegate = self
self.presentViewController(pickerVc, animated: true, completion: nil)
}
代理方法,准守的协议UIImagePickerControllerDelegate,UINavigationControllerDelegate
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
composePictureView.addImages(image.getImageScale(600))
picker.dismissViewControllerAnimated(true, completion: nil)
}
图片压缩方法
// 压缩图片
/*
指定宽度来压缩
宽 1200 指定宽度 600
高 600 x
*/
func getImageScale(width: CGFloat) -> UIImage{
// 如果当前图片的宽度 小于程序员指定的宽度
if self.size.width < width {
return self
}
// 获取图片的最终高度
let height = (width*self.size.height)/self.size.width
// 设置rect
let rect = CGRect(x: 0, y: 0, width: width, height: height)
// 通过上下文
// 01 开启上下文
UIGraphicsBeginImageContext(rect.size)
// 02 将图片渲染到上下文中
self.drawInRect(rect)
// 03 从上下文获取image
let result = UIGraphicsGetImageFromCurrentImageContext()
// 04 关闭上下文
UIGraphicsEndImageContext()
return result
}
