1.UIImage轉(zhuǎn)base64兼容問題

最近項(xiàng)目使用的UIImage轉(zhuǎn)base64 String上傳到后臺(tái)。使用UIImage轉(zhuǎn)NSData再轉(zhuǎn)base64 String上傳到后臺(tái)一直失敗。iOS自身用一直沒問題,后來搜索說UIImage改變了data結(jié)構(gòu)。

2.將UIImage寫會(huì)到文件,使用NSData直接讀取。

創(chuàng)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] ;
    }
    //+號(hào)必須替換為%2B，要不然同樣會(huì)失敗!
    base64String = [base64String stringByReplacingOccurrencesOfString:@"+" withString:@"%2B"] ;
    return base64String ;
}