xcode 在标签中显示 NSNumber
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Display NSNumber In Label
提问by Ahan Malhotra
I am trying to display an NSNumber from an array with keys into an UILabel. Here is my current code: marblesNeeded.text = [[[records objectAtIndex:0] valueForKey: @"marblesneeded"] intValue];
我正在尝试将数组中的 NSNumber 显示为 UILabel 中的键。这是我当前的代码：marblesNeeded.text = [[[records objectAtIndex:0] valueForKey: @"marblesneeded"] intValue];
I also get the error:
warning: Semantic Issue: Incompatible integer to pointer conversion assigning to 'NSString *' from 'int'
我也收到错误：
warning: Semantic Issue: Incompatible integer to pointer conversion assigning to 'NSString *' from 'int'
Thanks
谢谢
回答by NJones
You need to create an NSString to set the text of a UILabel.
您需要创建一个 NSString 来设置 UILabel 的文本。
marblesNeeded.text = [NSString stringWithFormat:@"%i",[[[records objectAtIndex:0] valueForKey: @"marblesneeded"] intValue]];
In the format %i denotes that you will be providing an integer value after the format.
在格式 %i 中，您将在格式后提供一个整数值。
Edit:
编辑：
As some comments have noted NSNumber does have a stringValue, it does work but is not my personal preference because it gives you little control as to the format of the string. Consider this example.
正如一些评论所指出的，NSNumber 确实有一个 stringValue，它确实有效，但不是我个人的偏好，因为它使您几乎无法控制字符串的格式。考虑这个例子。
NSNumber *number = [NSNumber numberWithFloat:3.25];
NSLog(@"%@",number.stringValue); // Will print 3.25
NSLog(@"%@",[NSString stringWithFormat:@"%i",number.intValue]); // Will print 3
Since the question envolved printing an intValue this more explicit format may be necessary.
由于问题涉及打印 intValue 这种更明确的格式可能是必要的。
回答by Owen Hartnett
marblesNeeded.text = [[[records objectAtIndex:0] valueForKey: @"marblesneeded"] stringValue];
