删除本地文件#ifndef USERINFOPATH#define USERINFOPATH [NSString stringWithFormat:@"%@/%@info.plist",DOCUMENTS, [[NSUserDefaults standardUserDefaults] stringForKey:USERID]]#endif/** Delete a file **/+ (BOOL) DeleteSingleFile:(NSString *)filePath{    NSError *err = nil;        if (nil == filePath) {        return NO;    }        NSFileManager *appFileManager = [NSFileManager defaultManager];        if (![appFileManager fileExistsAtPath:filePath]) {        return YES;    }        if (![appFileManager isDeletableFileAtPath:filePath]) {        return NO;    }        return [appFileManager removeItemAtPath:filePath error:&err;];}//调用    if ([SupportClass DeleteSingleFile:USERINFOPATH]) {        NSLog(@"删除成功");    };