在处理个人资料 - 头像的时候，通常有两个选项，一个是调用系统相机，一个是调用系统相册。这里要使用的就是UIImagePickerController方法。
在头像位置的imageView添加一个手势，或者添加一个透明的按钮，用来实现click方法，直接上代码：
- (IBAction)click:(id)sender{
//创建提醒视图
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"提醒" message:nil preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *alertAction = [UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDestructive handler:^(UIAlertAction *action) {
//判断设备是否存在摄像头，有就调用系统相机，没有，就提醒用户
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
//创建相机
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
//文件由来
picker.sourceType = UIImagePickerControllerSourceTypeCamera; //指定数据来源来自于相机
picker.delegate = self;// 指定代理
picker.allowsEditing = YES; //允许编辑
//模态弹出
[self presentViewController:picker animated:YES completion:nil];
}else{
//没有摄像头，提醒用户 您的设备没有摄像头
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"您的设备没有摄像头" message:nil preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *alertAction1 = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDestructive handler:nil];
[alertController addAction:alertAction1];
[self presentViewController:alertController animated:YES completion:nil];
}
}];
[alertController addAction:alertAction];
UIAlertAction *alertAction2 = [UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {
UIImagePickerController *pickerC = [[UIImagePickerController alloc] init];
pickerC.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;//指定数据来源为相册
pickerC.delegate = self; //指定代理
pickerC.allowsEditing = YES; // 允许编辑
[self presentViewController:pickerC animated:YES completion:nil];
}];
[alertController addAction:alertAction2];
[self presentViewController:alertController animated:YES completion:nil];
}
//选取图片之后执行的方法
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{
NSLog(@"%@",info);
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
self.photoImage.image = image;
[picker dismissViewControllerAnimated:YES completion:nil];
}