objective-c - 将 NSString 转换为 Integer 并检查它是否小于或等于某个值

Question

我有一个以 NSString 形式返回距离的项目。我想检查该距离以查看它是小于或等于还是大于 10,000 英尺。我遇到了一个错误，指出“ARC 不允许将‘int’隐式转换为‘NSString *’。”有谁知道如何将 NSString 转换为整数？或者如何构建代码？谢谢你!

- (IBAction)btnPress:(id)sender {

NSString *distanceInFeet = [[NSUserDefaults standardUserDefaults]
                           stringForKey:@"distanceInFeet"];

if ([distanceInFeet intValue] <= 10000)
{

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Close" message:@"Distance is close" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
    [alert show];
    return;

else
{
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Far" message:@"Distance is far" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil, nil];
    [alert show];
    return;
}

} 

Answer 1

你为什么不试试这个呢？

if ([distanceInFeet intValue]<=10000)
{

或

if ([distanceInFeet integerValue]<=10000)
{

编辑:

根据您对代码的编辑，并更正显示的错误...

NSString *distanceInFeet = [NSString alloc] initWithFormat:@"%ld", [[NSUserDefaults standardUserDefaults]
                           stringForKey:@"distanceInFeet"]];