iOS 调用拍照、选择本地相册、上传功能－－－未完善。

1.新建viewController 拖入一个Button,添加点击事件，使用代理方法

<UIActionSheetDelegate,UIImagePickerControllerDelegate>

2.代码如下- (IBAction)DoChoose:(id)sender {

UIActionSheet *sheet;
//检查是否有摄像头功能
if (![UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

sheet = [[UIActionSheet alloc]
initWithTitle:@"选择"
delegate:self
cancelButtonTitle:nil
destructiveButtonTitle:@"取消"
otherButtonTitles:@"拍照",@"从相册选择", nil];
}
else
{
sheet = [[UIActionSheet alloc]
initWithTitle:@"选择"
delegate:self
cancelButtonTitle:nil
destructiveButtonTitle:@"取消"
otherButtonTitles:@"从相册选择", nil];
}
sheet.tag=255;
[sheet showInView:self.view];
}

//代理方法，启用拍照或使用相册功能
-(void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
if (actionSheet.tag == 255) {
NSUInteger sourceType = 0;
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
switch (buttonIndex) {
case 0:
return;
case 1:
sourceType = UIImagePickerControllerSourceTypeCamera;
break;
case 2:
sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
break;
default:
break;
}
}
else
{
if (buttonIndex ==0) {
return;
}
else
{
sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
}
}

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

imagePickerController.delegate = self;

imagePickerController.allowsEditing = YES;

imagePickerController.sourceType = sourceType;

[self presentViewController:imagePickerController animated:YES completion:^{}];
}
}

//返回的图片数据
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info
{
//返回到主界面中
[picker dismissViewControllerAnimated:YES completion:^{}];

//获取返回的图片
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

//压缩图片
NSData *imageData = UIImageJPEGRepresentation(image, 0.5);

//沙盒，准备保存的图片地址和图片名称
NSString *fullPath = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"x.jpg"];

//将图片写入文件中
[imageData writeToFile:fullPath atomically:NO];

//通过路径获取到保存的图片，可以在主界面上的image进行预览
UIImage *saveImage = [[UIImage alloc]initWithContentsOfFile:fullPath];

[self.img1 setImage:saveImage];

//将图片变为Base64格式，可以将数据通过接口传给后台
NSData *data = UIImageJPEGRepresentation(saveImage, 1.0f);

NSString *baseString = [data base64Encoding];
}

//关闭拍照窗口
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
[self dismissViewControllerAnimated:YES completion:^{}];
}