1.UIImage转base64兼容问题

最近项目使用的UIImage转base64 String上传到后台。使用UIImage转NSData再转base64 String上传到后台一直失败。iOS自身用一直没问题,后来搜索说UIImage改变了data结构。

2.将UIImage写会到文件,使用NSData直接读取。

创建UIImage Category 方法。

- (NSString *)base64String {
    NSData *imageData = nil;
    NSString *mimeType = nil;
    NSString *suffix = nil ;
    if ([self imageHasAlpha]) {
        imageData = UIImagePNGRepresentation(self);
        mimeType = @"image/png";
        suffix = @".png" ;
    } else {
        imageData = UIImageJPEGRepresentation(self, 0.5f);
        mimeType = @"image/jpeg";
        suffix = @".jpeg" ;
    }
    NSString *filePath = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) firstObject] ;
    NSString *fileName = [filePath stringByAppendingFormat:@"/temp%@", suffix] ;
    [imageData writeToFile:fileName atomically:YES] ;
    NSData *data = [NSData dataWithContentsOfFile:fileName] ;
    NSString *base64String = [NSString stringWithFormat:@"data:%@;base64,%@", mimeType,
            [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength]];
    NSFileManager *fileManager = [NSFileManager defaultManager] ;
    if ([fileManager fileExistsAtPath:fileName]) {
        [fileManager removeItemAtPath:filePath error:nil] ;
    }
    //+号必须替换为%2B，要不然同样会失败!
    base64String = [base64String stringByReplacingOccurrencesOfString:@"+" withString:@"%2B"] ;
    return base64String ;
}