iOS图片来源有三种方法：
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
UIImagePickerControllerSourceTypePhotoLibrary, //1.从图库中选择
UIImagePickerControllerSourceTypeCamera, //2.直接调用摄像头拍照
UIImagePickerControllerSourceTypeSavedPhotosAlbum //3.从相册中选择
} __TVOS_PROHIBITED;
UIImagePickerController是系统提供的用来获取图片和视频的接口，用UIImagePickerController类来获取图片视频，大体分为以下几个步骤：
1. 实例化UIImagePickerController
2. 设置UIImagePickerController数据来源类型
3. 设置代理，遵循UIImagePickerControllerDelegate,UINavigationControllerDelegate协议
4. 实现代理方法接收选取图片并做处理
在代理中获取我们选中的图片，UIImagePickerControllerDelegate代理中一共三个方法，其中一个3.0已经废弃了，只剩下两个我们需要用的。
//1.当用户选取完成后调用；
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info;
//2.当用户取消选取时调用；
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;
我们主要使用第一个代理方法，在选取图片完成后会调用，返回一个info字典。
实际使用展示：
@interface SelecteImageViewController ()<UIImagePickerControllerDelegate, UINavigationControllerDelegate>
@property (nonatomic, strong) UIImagePickerController *picker;
@property (nonatomic, strong) UIImageView *selectImageView;
@end
@implementation SelecteImageViewController
- (void)imageViewDidClick:(UIImageView *)imageView ForIndex:(NSInteger)index {
UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
[alertController addAction:[UIAlertAction actionWithTitle:@"相机" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[weakSelf goCameraViewController];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"相册" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
[weakSelf directGoPhotoViewController];
}]];
[alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:nil]];
[self presentViewController:alertController animated:YES completion:nil];
}
-(void)goCameraViewController {
// 如果摄像头可用
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
//
self.picker.sourceType = UIImagePickerControllerSourceTypeCamera;
self.picker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
self.picker.cameraDevice = UIImagePickerControllerCameraDeviceRear;
} else {
[XWHUDManager showErrorTipHUD:@"无法打开摄像头"];
return;
}
[self presentViewController:self.picker animated:YES completion:nil];
}
-(void)directGoPhotoViewController {
self.picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
[self presentViewController:self.picker animated:YES completion:nil];
}
/**
拍照或选择图片后的回调
@param picker <#picker description#>
@param info <#info description#>
*/
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<UIImagePickerControllerInfoKey,id> *)info {
FTLog(@"info--->成功：%@", info);
// 获取用户拍摄的是照片还是视频
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
// 判断获取类型：图片，并且是刚拍摄的照片
if ([mediaType isEqualToString:(NSString *)kUTTypeImage] && picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
UIImage *theImage = nil;
// 判断，图片是否允许修改
if ([picker allowsEditing]) {
// 获取用户遍及之后的图像
theImage = [info objectForKey:UIImagePickerControllerEditedImage];
} else {
// 获取原始图像
theImage = [info objectForKey:UIImagePickerControllerOriginalImage];
}
// 保存图片到相册中
UIImageWriteToSavedPhotosAlbum(theImage, self, nil, nil);
}
[picker dismissViewControllerAnimated:YES completion:nil];
}
-(UIImagePickerController *)picker {
if (!_picker) {
_picker = [[UIImagePickerController alloc] init];
_picker.delegate = self;
_picker.editing = YES;
}
return _picker;
}
@end
