ios 使用ELCImagePicker实现相册照片多选和真机拍照调试

ELCImagePicker相册图片多选效果

1.ELCImagePicker是第三方框架用来处理相册中的图片多选，在头文件中先导入

#import "ELCImagePickerController.h"

。实现的代码如下

- (void)showImagePicker{
ELCImagePickerController *imagePicker = [[ELCImagePickerController alloc] initImagePicker];
imagePicker.maximumImagesCount = 3 - self.model.bookImageArray.count;
imagePicker.returnsOriginalImage = YES;
imagePicker.returnsImage = YES;
imagePicker.onOrder = YES;
imagePicker.mediaTypes = @[(NSString *)kUTTypeImage];
imagePicker.imagePickerDelegate = self;

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

第一个属性设置了相册允许选择照片的最大数量，这里最多选择3张，再减去现有的图片。第二个属性允许返回原始的图片，并且按照顺序返回。重要的是要设置控制器的代理。

2.代理函数如下:

#pragma mark - imagePickerController 代理
- (void)elcImagePickerControllerDidCancel:(ELCImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:nil];
}

- (void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info {
[picker dismissViewControllerAnimated:YES completion:nil];

for (NSDictionary *dict in info) {
if ([dict objectForKey:UIImagePickerControllerOriginalImage]) {
UIImage *image = [dict objectForKey:UIImagePickerControllerOriginalImage];
// 压缩图片
UIImage *resizedImage = [image compressImage:300];
[self.model.bookImageArray addObject:resizedImage];
}
}
[self.imageCollectionView reloadData];
}

在代理函数中返回原始图片，在UIImage分类中写了一个函数

-- (UIImage *)compressImage:(CGFloat)size

函数用来压缩图片。

真机拍照处理

1.由于在模拟器无法使用相机，弹出警告框，需要真机模拟，使用

UIImagePickerController

控制器,代码如下:

- (void)showCamera{
UIImagePickerController *picker = [[UIImagePickerController alloc] init];
picker.delegate = self;
//    picker.allowsEditing = YES;
// 监测权限
AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:picker animated:YES completion:nil];
} else if (authStatus == AVAuthorizationStatusRestricted || authStatus ==AVAuthorizationStatusDenied) {
UIAlertView * alart = [[UIAlertView alloc]initWithTitle:@"温馨提示" message:@"请您设置允许APP访问您的相机\n设置>隐私>相机" delegate:self cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
[alart show];
} else {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"设备不支持相机！" message:@"请从相册中选取照片。" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles: nil];
[alert show];
}
}

2.代理处理函数如下:

#pragma mark - UIImagePickerController代理
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{
[picker dismissViewControllerAnimated:YES completion:nil];
}

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
[self dismissViewControllerAnimated:YES completion:nil];
UIImage *image = info[UIImagePickerControllerOriginalImage];
UIImage *resizedImage = [image compressImage:300];
[self.model.bookImageArray addObject:resizedImage];
[self.imageCollectionView reloadData];
}