Question

我正在阅读有关如何使用UIPicker的教程，并找到了这段代码：

- (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正确显示，选择器中的变量也能正确显示。当按下按钮时，警报消息确实出现，但它说“你选择了......”然后它是一堆乱码。为什么数组变量没有正确传递？

Answer 1

您需要在initWithFormat字符串中使用％@，而不是％a

有关详细信息，请参阅此处：http://developer.apple.com/mac/library/documentation/cocoa/conceptual/strings/Articles/FormatStrings.html

iphone无法正确显示数组变量

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