NSNumber：stringValue 崩溃，描述有效
[measureValue stringValue] 给了我这个异常：
由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[NSCFString stringValue]：无法识别的选择器发送到实例 0x4dde570”
[measureValue description] 工作正常
但我认为我应该使用 stringValue< /code> 在代码中，对吧？
这是代码：
NSNumber *measureValue = [NSString stringWithFormat:@"%i", [cellContent integerValue]];
//if imperial (inches)
if ([[[NSUserDefaults standardUserDefaults] stringForKey:@"Measure"] isEqualToString:@"Imperial"] ) {
//if height
if ([currentQuestion isEqualToString:@"Height"]) {
measureValue = [NSNumber numberWithDouble:(2.54 * [measureValue doubleValue])];
//elseif weight
} else {
measureValue = [NSNumber numberWithDouble:(0.45359237 * [measureValue doubleValue])];
}
//NSLog(@"%@", [measureValue stringValue]);
cellContent = [measureValue description];
[measureValue stringValue] gives me this exception:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSCFString stringValue]: unrecognized selector sent to instance 0x4dde570'
[measureValue description] works perfectly
But I think I should use stringValue in the code, right?
This is the code:
NSNumber *measureValue = [NSString stringWithFormat:@"%i", [cellContent integerValue]];
//if imperial (inches)
if ([[[NSUserDefaults standardUserDefaults] stringForKey:@"Measure"] isEqualToString:@"Imperial"] ) {
//if height
if ([currentQuestion isEqualToString:@"Height"]) {
measureValue = [NSNumber numberWithDouble:(2.54 * [measureValue doubleValue])];
//elseif weight
} else {
measureValue = [NSNumber numberWithDouble:(0.45359237 * [measureValue doubleValue])];
}
//NSLog(@"%@", [measureValue stringValue]);
cellContent = [measureValue description];
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该行返回一个 NSString，而不是 NSNumber。您正在将 stringValue 发送到 NSString。
That line returns an NSString, not an NSNumber. You're sending stringValue to the NSString.