iOS中 读取相册,调用系统相机

读取相册以及调取相机,将图片显示到imageView上

布局：

1.创建imageView 和 button 并为button一个关联pickerImage的事件

self.aImageView = [[UIImageView alloc]initWithFrame:CGRectMake(60, 100, 200, 200)];

self.aImageView.backgroundColor = [UIColor redColor];

self.aImageView.userInteractionEnabled = YES;

self.aButton = [[UIButton alloc]initWithFrame:CGRectMake(98, 350, 125, 25)];

self.aButton.backgroundColor = [UIColor blueColor];

[self.aButton addTarget:self action:@selector(pickerImage:) forControlEvents:(UIControlEventTouchUpInside)];

[self.aButton setTitle:@"选择图像" forState:(UIControlStateNormal)];

[self.view addSubview:self.aButton];

[self.view addSubview:self.aImageView];

[self.aButton release];

[self.aImageView release];

[self addTapGestureOnImageView];

2.因为有的场景需要直接点击图片更换别的图片，所以在imageView上添加轻拍动作

- (void)addTapGestureOnImageView{

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(pickerImage:)];

[self.aImageView addGestureRecognizer:tap];

[tap release];

}

3.实现轻拍动作中方法

- (void)pickerImage:(UIButton *)button{

//添加ActionSheet控件，提示选项框，调出相机或拍摄图片

//第一个参数：是行为列表的标题 一般为空

//第二个参数：遵循代理

//第三个参数：取消这个操作按钮上 显示的文字

//第四个参数：destructive 破坏性的, 毁灭性的 自己理解吧 反正我写的是拍照，执行操作的意思

//第五个参数：从相册选取图片

UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:@"拍照" otherButtonTitles:@"从相册选择图片", nil];

//在当前界面显示actionSheet对象

[actionSheet showInView:self.view];

[actionSheet release];

}

4.实现action代理协议中的方法

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{

switch (buttonIndex) {

case 0:

//调用系统相机，拍照

[self pickerPictureFromCamera];

break;

case 1:

[self pickerPictureFromPhotosAlbum];

default:

break;

}

}

4.1从摄像头获取图片

- (void)pickerPictureFromCamera{

//判断前摄像头是否可用，如果不可用的话，用后摄像头。如果后摄像头也不可用的话用手机图片库

//判断前置摄像头是否可用

if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront]) {

NSLog(@"用前置摄像头");

self.imagePC = [[UIImagePickerController alloc]init];

self.imagePC.cameraDevice = UIImagePickerControllerCameraDeviceFront;

[self.imagePC release];

//判断后置摄像头是否可用

}else if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]){

NSLog(@"用后置摄像头");

self.imagePC = [[UIImagePickerController alloc]init];

self.imagePC.cameraDevice = UIImagePickerControllerCameraDeviceRear;

[self.imagePC release];

//两者都不行的话，从手机相册调取照片

}else{

UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"调用摄像头失败" message:@"请从手机相册中选取照片" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];

[alertView show];

[alertView release];

}

//初始化图片控制器对象

UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];

//sourceType资源样式

//设置图片选择器选择图片的样式

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//设置图片是否允许编辑

imagePicker.allowsEditing = YES;

//设置图片选择器代理对象为这个视图控制器

imagePicker.delegate = self;

//把相机推出来 模态

[self presentViewController:imagePicker animated:YES completion:nil];

//释放

[imagePicker release];

}

4.2从手机的图片库获取图片

- (void)pickerPictureFromPhotosAlbum{

//初始化图片控制器对象

UIImagePickerController *imagePicker = [[UIImagePickerController alloc]init];

//sourceType资源样式

//设置图片选择器选择图片的样式

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//设置图片是否允许编辑

imagePicker.allowsEditing = YES;

//设置图片选择器代理对象为这个视图控制器

imagePicker.delegate = self;

//把选择控制器推出来 模态

[self presentViewController:imagePicker animated:YES completion:nil];

//释放

[imagePicker release];

}

5.将选取好的照片保存到详情页的方法

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{

//以相册作为字典，从中取出照片

self.aImageView.image = [info objectForKey:UIImagePickerControllerEditedImage];

//把选取框模态回去

[self dismissViewControllerAnimated:YES completion:nil];

}