如何将 NSNumber 转换为 NSString

发布于 2024-09-28 07:35:21 字数 666 浏览 5 评论 0原文

所以我有一个带有 NSNumberNSStringNSArray “myArray”。我需要它们在另一个 UIView 中,所以我像这样:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

DetailViewController *details = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
details.subjectText = [[myArray objectAtIndex:indexPath.row] objectForKey:@"subject"];

subjectText 有效。 但是我怎样才能从中获取 NSNumber 呢? (我实际上需要它们作为字符串......) 我会将 NSStringNSNumber 转换出来,如下所示: NSString *blah = [NSNumber intValue]。但我不知道如何在上面的代码中设置它......

So I have an NSArray "myArray" with NSNumbers and NSStrings. I need them in another UIView so i go like this:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

DetailViewController *details = [[DetailViewController alloc] initWithNibName:@"DetailView" bundle:nil];
details.subjectText = [[myArray objectAtIndex:indexPath.row] objectForKey:@"subject"];

The subjectText works.
But how can I get the NSNumbers out of it? (I actually need them as strings...)
I would convert a NSString out of a NSNumber like this:
NSString *blah = [NSNumber intValue]. But I don't know how to set it up in the code above...

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成熟稳重的好男人 2024-10-05 07:35:21

尝试:

NSString *myString = [NSNumber stringValue];

Try:

NSString *myString = [NSNumber stringValue];
浪荡不羁 2024-10-05 07:35:21

你可以这样做:

NSNumber *myNumber = @15;
NSString *myNumberInString = [myNumber stringValue];

You can do it with:

NSNumber *myNumber = @15;
NSString *myNumberInString = [myNumber stringValue];
仄言 2024-10-05 07:35:21
//An example of implementation :
// we set the score of one player to a value
[Game getCurrent].scorePlayer1 = [NSNumber numberWithInteger:1];
// We copy the value in a NSNumber
NSNumber *aNumber = [Game getCurrent].scorePlayer1;
// Conversion of the NSNumber aNumber to a String with stringValue
NSString *StringScorePlayer1 = [aNumber stringValue];
//An example of implementation :
// we set the score of one player to a value
[Game getCurrent].scorePlayer1 = [NSNumber numberWithInteger:1];
// We copy the value in a NSNumber
NSNumber *aNumber = [Game getCurrent].scorePlayer1;
// Conversion of the NSNumber aNumber to a String with stringValue
NSString *StringScorePlayer1 = [aNumber stringValue];
淡莣 2024-10-05 07:35:21

或尝试 NSString *string = [NSString stringWithFormat:@"%d", [NSNumber intValue], nil];

or try NSString *string = [NSString stringWithFormat:@"%d", [NSNumber intValue], nil];

甜味超标? 2024-10-05 07:35:21

有趣的是,如果 NSNumber 成为字符串的一部分,它会自动转换为字符串。我认为没有记录。
尝试以下操作:

NSLog(@"My integer NSNumber:%@",[NSNumber numberWithInt:184]);
NSLog(@"My float NSNumber:%@",[NSNumber numberWithFloat:12.23f]);
NSLog(@"My bool(YES) NSNumber:%@",[NSNumber numberWithBool:YES]);
NSLog(@"My bool(NO) NSNumber:%@",[NSNumber numberWithBool:NO]);

NSString *myStringWithNumbers = [NSString stringWithFormat:@"Int:%@, Float:%@ Bool:%@",[NSNumber numberWithInt:132],[NSNumber numberWithFloat:-4.823f],[NSNumber numberWithBool:YES]];
NSLog(@"%@",myStringWithNumbers);

它将打印:

My integer NSNumber:184
My float NSNumber:12.23
My bool(YES) NSNumber:1
My bool(NO) NSNumber:0
Int:132, Float:-4.823 Bool:1

Works on those Mac and iOS

This one does not work:

NSString *myNSNumber2 = [NSNumber numberWithFloat:-34512.23f];

The funny thing is that NSNumber converts to string automatically if it becomes a part of a string. I don't think it is documented.
Try these:

NSLog(@"My integer NSNumber:%@",[NSNumber numberWithInt:184]);
NSLog(@"My float NSNumber:%@",[NSNumber numberWithFloat:12.23f]);
NSLog(@"My bool(YES) NSNumber:%@",[NSNumber numberWithBool:YES]);
NSLog(@"My bool(NO) NSNumber:%@",[NSNumber numberWithBool:NO]);

NSString *myStringWithNumbers = [NSString stringWithFormat:@"Int:%@, Float:%@ Bool:%@",[NSNumber numberWithInt:132],[NSNumber numberWithFloat:-4.823f],[NSNumber numberWithBool:YES]];
NSLog(@"%@",myStringWithNumbers);

It will print:

My integer NSNumber:184
My float NSNumber:12.23
My bool(YES) NSNumber:1
My bool(NO) NSNumber:0
Int:132, Float:-4.823 Bool:1

Works on both Mac and iOS

This one does not work:

NSString *myNSNumber2 = [NSNumber numberWithFloat:-34512.23f];
迷迭香的记忆 2024-10-05 07:35:21

在 Swift 中你可以这样做

let number : NSNumber = 95
let str : String = number.stringValue

In Swift you can do like this

let number : NSNumber = 95
let str : String = number.stringValue
分分钟 2024-10-05 07:35:21

在 Swift 3.0

let number:NSNumber = 25
let strValue = String(describing: number as NSNumber)
print("As String => \(strValue)")

我们可以获取 String 中的数字值。

In Swift 3.0

let number:NSNumber = 25
let strValue = String(describing: number as NSNumber)
print("As String => \(strValue)")

We can get the number value in String.

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