iPhone 无法正确显示数组变量
我正在阅读有关如何制作 UIPicker 的教程，并发现了以下代码：
- (IBAction)buttonPressed {
NSInteger row = [userPicker selectedRowInComponent:0];
NSString *selected = [userPickerData objectAtIndex:row];
NSString *title = [[NSString alloc] initWithFormat:@"You selected %a", selected];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:@"Thank you for Choosing." delegate:nil cancelButtonTitle:@"You're Welcome" otherButtonTitles:nil];
[alert show];
[alert release];
[title release];
}
- (void)viewDidLoad {
// [super viewDidLoad];
NSArray *array = [[NSArray alloc] initWithObjects:@"New", @"Frank", @"Bob", @"Thor", nil];
self.userPickerData = array;
[array release];
}
UIPicker 显示正确，选择器中的变量也显示正确。当按下按钮时，确实会出现警报消息，但它会显示“您选择了..”，然后是一堆乱码。为什么数组变量没有正确传递？
I was reading a tutorial on how to do a UIPicker and found this code:
- (IBAction)buttonPressed {
NSInteger row = [userPicker selectedRowInComponent:0];
NSString *selected = [userPickerData objectAtIndex:row];
NSString *title = [[NSString alloc] initWithFormat:@"You selected %a", selected];
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title message:@"Thank you for Choosing." delegate:nil cancelButtonTitle:@"You're Welcome" otherButtonTitles:nil];
[alert show];
[alert release];
[title release];
}
- (void)viewDidLoad {
// [super viewDidLoad];
NSArray *array = [[NSArray alloc] initWithObjects:@"New", @"Frank", @"Bob", @"Thor", nil];
self.userPickerData = array;
[array release];
}
The UIPicker displays correctly and the variables in the picker also display correctly. When the button is pressed then the alert message does come up but it says, "You selected.." and then it's a bunch of gibberish. Why aren't the array variables being passed correctly?
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您需要在 initWithFormat 字符串中使用 %@，而不是 %a
请参阅此处了解更多信息：http://developer.apple.com/mac/library/documentation/cocoa/conceptual/strings/Articles/FormatStrings.html
You need to use %@ in your initWithFormat string, rather than %a
See here for more info: http://developer.apple.com/mac/library/documentation/cocoa/conceptual/strings/Articles/FormatStrings.html