图片保存到相册⬇️

Photos.framework 系统库

#import <Photos/Photos.h>//系统头文件

[[PHPhotoLibrary sharedPhotoLibrary] performChanges:^{

UIImage * images = [UIImage imageWithContentsOfFile:@""];

PHAssetChangeRequest *req = [PHAssetChangeRequest creationRequestForAssetFromImage:images];

}completionHandler:^(BOOL success, NSError * _Nullable error) {

保存失败回调

}];

图片压缩⬇️

UIImage *img = [UIImage imageWithContentsOfFile:imageName];

UIGraphicsBeginImageContext(CGSizeMake(width, height));

[img drawInRect:CGRectMake(0, 0, width, height)];

UIImage *scaledImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

NSData *imgDataJpg = UIImageJPEGRepresentation(scaledImage,0.01);

NSString *base64 = [imgDataJpg base64Encoding];//这根据需求来可以不用转base64字符串