iOS之设置头像（访问系统相册、本地上传）

1.

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:                               @"设置头像" delegate:self cancelButtonTitle:@"取消"                       destructiveButtonTitle:nil otherButtonTitles:@"选择本地图片",@"拍照", nil];

[actionSheet showInView:self.view];

//2.实现相应代理事件,代理UIActionSheetDelegate,方法如下

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

// 相册 0 拍照 1

switch (buttonIndex) {

case 0:

//从相册中读取

[self readImageFromAlbum];

break;

case 1:

//拍照

[self readImageFromCamera];

break;

default:

break;

}

}

//3.实现从相册读取图片功能,代码如下

//从相册中读取

- (void)readImageFromAlbum {

//创建对象

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

//（选择类型）表示仅仅从相册中选取照片

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

//指定代理，因此我们要实现UIImagePickerControllerDelegate,                                                 UINavigationControllerDelegate协议

imagePicker.delegate = self;

//设置在相册选完照片后，是否跳到编辑模式进行图片剪裁。(允许用户编辑)

imagePicker.allowsEditing = YES;

//显示相册

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

}

//4.实现拍照功能

- (void)readImageFromCamera {

if ([UIImagePickerController isSourceTypeAvailable:                                           UIImagePickerControllerSourceTypeCamera]) {

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];         imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;         imagePicker.delegate = self;

imagePicker.allowsEditing = YES;

//允许用户编辑

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

} else {

//弹出窗口响应点击事件

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"警告"                         message:@"未检测到摄像头" delegate:nil cancelButtonTitle:nil                                                 otherButtonTitles:@"确定", nil];

[alert show];

}

}

//5.图片完成处理后提交,代理方法UIPickerControllerDelegate

//图片完成之后处理

- (void)imagePickerController:(UIImagePickerController *)picker        didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo {

//image 就是修改后的照片

//将图片添加到对应的视图上

[_headImageView setImage:image];

//结束操作

[self dismissViewControllerAnimated:YES completion:nil];

}