swift开发笔记17 - 使用相机修改图片

实现修改头像的功能，首先给给一个图片添加点击事件，在事件处理函数中打开摄像头，自拍，选定照片后修改图片内容。

1 给图片增加点击事件

 //图片引用：
    @IBOutlet weak var goWork: UIButton!
 override func viewDidLoad() {
      /////设置允许交互属性
      goWorkFace.userInteractionEnabled = true
      ////添加tapGuestureRecognizer手势
        let tapGR1 = UITapGestureRecognizer(target: self,action: "ontapHandler:")
        goWorkFace.addGestureRecognizer(tapGR1)
}
//FIXME:上班手势处理函数
  func ontapHandler(sender:UITapGestureRecognizer) {
        ///////todo....
        print(“图片被点击”)
}

2 添加相机

先给类增加代理：

UIImagePickerControllerDelegate,UINavigationControllerDelegate

var imagePicker: UIImagePickerController!

修改viewDidLoad():

 override func viewDidLoad() {
      /////设置允许交互属性
      goWorkFace.userInteractionEnabled = true
      ////添加tapGuestureRecognizer手势
        let tapGR1 = UITapGestureRecognizer(target: self,action: "ontapHandler:")
        goWorkFace.addGestureRecognizer(tapGR1)
       //初始化图片选择器
        imagePicker =  UIImagePickerController()
        //检测相机是否可用
        let isAvailable = UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)
        //必须首先设置sourceType 然后再设置其他属性 否则会出异常，提示sourceType 必须是 UIImagePickerControllerSourceTypeCamera
        imagePicker.sourceType = .PhotoLibrary
        if isAvailable {
            imagePicker.sourceType = .Camera
            //如果有前置摄像头则调用前置摄像头
            imagePicker.cameraDevice = UIImagePickerControllerCameraDevice.Front
            //是否显示控制栏
            imagePicker.showsCameraControls=true
        }
        //是否可编辑
        imagePicker.allowsEditing=true
        //代理
        imagePicker.delegate = self 
}

 func imagePickerController(picker: UIImagePickerController!,didFinishPickingImage image: UIImage!,editingInfo: [NSObject : AnyObject]!) {
        //保存图片 
            self.goWorkFace.image=image
          imagePicker.dismissViewControllerAnimated(true){
            print("关闭相机返回") 
        }
    }

注意：

1 如果相机界面的按钮文字默认是英文，要显示中文需要修改project 属性：

2 网上说要想使用相机首先要修改plist文件，在required device capabilities添加一项：still-camera=1。

这个只是用来声明该软件需要具备相机硬件，可不加。