ACM_Someone like you

if(為空)
{
     做提示對話框等操作
}
else
{
     正常執(zhí)行
}

 - (BOOL) isBlankString:(NSString *)string {//判斷字符串是否為空 方法

    if (string == nil || string == NULL) {
        return YES;
    }
    if ([string isKindOfClass:[NSNull class]]) {
        return YES;
    }
    if ([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length]==0) {
        return YES;
    }
    return NO;
}