之前写过, 觉得有些逻辑不是很妥当, 重写一篇
引入这个是为了访问相册, 存储拍照后的图片
#import <Photos/Photos.h>
签协议
@interface ViewController ()<UIImagePickerControllerDelegate, UINavigationControllerDelegate>
声明属性
@property (nonatomic, strong) UIImagePickerController *imagePickerController;
先说用户选择拍照的情况, 涉及判断用户设备是否有相机, 是否允许使用相机, imagePickerController属性可以写懒加载, 因为都是取单张照片, 没必要每次都开辟空间, 但如果是取多张照片, 建议不要这么玩, 前面说过不再说
#pragma mark - 选择拍照
- (void)goTakePic:(UIButton *)button{
//判断相机是否可用
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
//判断是否开启相机权限
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];
//权限未开启
if (authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){
[self userDidNotAllowCamera];
}
//权限已开启
else{
_imagePickerController = [[UIImagePickerController alloc] init];
_imagePickerController.delegate = self;
//模态推出照相机页面的样式
_imagePickerController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
_imagePickerController.allowsEditing = YES;
self.imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:self.imagePickerController animated:YES completion:^{}];
}
}
//适用于没有相机的设备
else{
[self userDidnotHaveCamera];
}
}
#pragma mark - 用户没有相机
- (void)userDidnotHaveCamera{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"抱歉" message:@"相机不可用" preferredStyle:UIAlertControllerStyleAlert];
[self presentViewController:alertController animated:YES completion:nil];
//让alert自动消失
[NSTimer scheduledTimerWithTimeInterval:1.5 target:self selector:@selector(creatAlert:) userInfo:alertController repeats:NO];
}
#pragma mark 让警告消失
- (void)creatAlert:(NSTimer *)timer{
UIAlertController *alert = [timer userInfo];
[alert dismissViewControllerAnimated:YES completion:nil];
alert = nil;
}
#pragma mark 用户没有允许相机权限
- (void)userDidNotAllowCamera{
if ([UIDevice currentDevice].systemVersion.floatValue < 10){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"抱歉" message:@"您尚未开启相机权限" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionOK = [UIAlertAction actionWithTitle:@"去开启" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
//info plist中URL type中添加一个URL Schemes添加一个prefs值
if([[UIApplication sharedApplication] canOpenURL:url]){
//跳转到隐私
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Privacy&path=CAMERA"]];
}
}];
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"不了" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:actionOK];
[alertController addAction:actionCancel];
[self presentViewController:alertController animated:YES completion:nil];
}
else{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"抱歉" message:@"您尚未开启相机权限" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:actionCancel];
[self presentViewController:alertController animated:YES completion:nil];
}
}
================我是分割线=======================
接下来是选择去相册选择照片的情况, 其实和拍照差不多, 也就这句不一样,
self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
#pragma mark - 选择去相册
- (void)goToAlbum:(UIButton *)button{
_imagePickerController = [[UIImagePickerController alloc] init];
//去相册才会有效果
_imagePicker.navigationBar.barTintColor = kRGBColor(0, 148, 255);
//按钮字体颜色
_imagePicker.navigationBar.tintColor = [UIColor whiteColor];
//title字体大小和颜色
[[UINavigationBar appearance] setTitleTextAttributes:@{
NSForegroundColorAttributeName:[UIColor whiteColor],
NSFontAttributeName:[UIFont systemFontOfSize:16 * SCALE_WIDTH]
}];
//模态推出照相机页面的样式
_imagePickerController.modalTransitionStyle = UIModalTransitionStyleFlipHorizontal;
self.imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
self.imagePickerController.delegate = self;
//设置选择后的图片可被编辑
self.imagePickerController.allowsEditing = YES;
[self presentViewController:self.imagePickerController animated:YES completion:^{}];
}
====================分割线再次降临================
接下来是图片获取之后的协议方法, 拍照和相册共用这个协议方法, 所以加个判断, 如果是拍照才把拍后的图片存到相册, 从相册取就不用存了
注意, 可编辑要在协议方法里配合
[info objectForKey:UIImagePickerControllerEditedImage];
编辑后的图片才会生效
#pragma mark - ImagePicker delegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
//原图
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];
//这个本来是想用于拍照后编辑的, 发现并没有用
//self.isFullScreen = NO;
//用拍下来的照片赋值
_imageViewOfPic.image = image;
//只有选择拍照才会把照片保存到相册
if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
//访问相册权限, ios9之后的api, 要引入<Photos/Photos.h>
PHAuthorizationStatus status = [PHPhotoLibrary authorizationStatus];
//未开启相册权限
//PHAuthorizationStatusNotDetermined,
//PHAuthorizationStatusRestricted
//PHAuthorizationStatusDenied
if(status == PHAuthorizationStatusDenied){
[self userDidnotAllowAlbum];
}else{
//存入本地相册
UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
}
}
[picker dismissViewControllerAnimated:YES completion:nil];
}
#pragma mark 存储到系统相册结果回调
- (void)image:(UIImage*)image didFinishSavingWithError:(NSError*)error contextInfo:(void*)contextInfo{
if (error){
NSLog(@"%@", error);
}
else{
NSLog(@"保存成功");
}
}
#pragma mark 用户不允许使用相册
- (void)userDidnotAllowAlbum{
if ([UIDevice currentDevice].systemVersion.floatValue < 10){
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"您尚未开启相册权限" message:@"无法存入所拍的照片" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionOK = [UIAlertAction actionWithTitle:@"去开启" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
NSURL *url = [NSURL URLWithString:UIApplicationOpenSettingsURLString];
//info plist中URL type中添加一个URL Schemes添加一个prefs值
if([[UIApplication sharedApplication] canOpenURL:url]){
//跳转到隐私
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"prefs:root=Privacy&path=PHOTOS"]];
}
}];
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"不了" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:actionOK];
[alertController addAction:actionCancel];
[self presentViewController:alertController animated:YES completion:nil];
}
else{
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"您尚未开启相册权限" message:@"无法存入所拍的照片" preferredStyle:UIAlertControllerStyleAlert];
UIAlertAction *actionCancel = [UIAlertAction actionWithTitle:@"知道了" style:UIAlertActionStyleDefault handler:nil];
[alertController addAction:actionCancel];
[self presentViewController:alertController animated:YES completion:nil];
}
}