设置代理

<UINavigationControllerDelegate, UIImagePickerControllerDelegate>

点击头像按钮:

 UIAlertView * Alert=[[UIAlertView alloc]initWithTitle:@"请选择获取方式" message:@"" 
delegate:self cancelButtonTitle:@"取消" otherButtonTitles:
@"打开照相机",@"从手机相册获取", nil];
 Alert.delegate=self;
  [Alert show ];

调用相机相册,显示中文将Info.plist 文件中的
Localization native development region
设置为China

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
    if (buttonIndex == 1) {
        [self getAvatatFormCamera:self];//调用相机
    }
    if (buttonIndex ==2) {
        [self getAvatatFormPhotoLibrary:self];//调用相册
    }
}

相册

- (void)getAvatatFormPhotoLibrary:(UIViewController *)controller
{
//这里可以判断类型是相册还是相机
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        picker.delegate = self;
        //加上下面这句会有编辑框
        picker.allowsEditing = YES;
        [self presentViewController:picker animated:YES completion:nil];
    }
}

相机

- (void)getAvatatFormCamera:(UIViewController *)controller
{
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    picker.sourceType = UIImagePickerControllerSourceTypeCamera;
    picker.delegate = self;
    picker.showsCameraControls = YES;
    picker.allowsEditing = YES;
    [self presentViewController:picker animated:YES completion:nil];
}

选择照片或者拍照后:

#pragma - mark - UIImagePickerControllerDelegate
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
    //这里可以选择image类型,
    //原图:UIImagePickerControllerOriginalImage
    //获取编辑框里的图:UIImagePickerControllerEditedImage
    UIImage* image = [info objectForKey:UIImagePickerControllerEditedImage];
    
    [picker dismissViewControllerAnimated:YES completion:^{
        CGSize newSize = CGSizeMake(kw(300), kw(300));
        UIGraphicsBeginImageContext(newSize);
        UIImage *imagechuansong = image;
        [imagechuansong drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
        UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        //上传图片,以文件形式,还是base64在这调用就ok
    }];
}

以文件形式上传请看这里:
http://www.jianshu.com/p/5e1fe956822b