Ios 不完全执行
我在我的实现页面上收到了一个不完整的实现警告,我已将其注释掉:Ios 不完全执行,ios,xcode,Ios,Xcode,我在我的实现页面上收到了一个不完整的实现警告,我已将其注释掉: #import "BIDDatePickerViewController.h" @implementation BIDDatePickerViewController // Incomplete implementation @synthesize datePicker; - (IBAction)buttonPressed:(id)sender { NSDate *selected = [datePicker da
#import "BIDDatePickerViewController.h"
@implementation BIDDatePickerViewController // Incomplete implementation
@synthesize datePicker;
- (IBAction)buttonPressed:(id)sender
{
NSDate *selected = [datePicker date];
NSString *message = [[NSString alloc] initWithFormat:@"The date and time you selected is:%@", selected];
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Date and Time Selected"
message:message
delegate:nil
cancelButtonTitle:@"Yes I did"
otherButtonTitles:nil];
[alert show];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
NSDate *now = [NSDate date];
[datePicker setDate:now animated:NO];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
self.datePicker = nil;
}
@end
此外,消息的自定义部分(显示所选日期和时间)显示不正确。为什么?
以下是接口文件:
#import <UIKit/UIKit.h>
@interface BIDDatePickerViewController : UIViewController
@property (strong, nonatomic) IBOutlet UIDatePicker *datePicker;
-(IBAction)buttonPressed;
@end
#导入
@接口BIDDatePickerViewController:UIViewController
@属性(强,非原子)IBUIDatePicker*datePicker;
-(IBAction)按钮按下;
@结束
在.h文件中,您按下了-(iAction)按钮
并且在.m文件中,您已经按下了-(iAction)按钮:(id)sender
。您应该按下-(iAction)按钮
在.m文件中您收到警告的原因是您实现了方法-(iAction)buttonPressed:(id)sender
,而您定义了方法-(iAction)buttonPressed代码>。注意界面上没有参数。谢谢,这很有效。无法找出NSDate*selected未传递到UIAlertView消息的原因。消息的其余部分正在显示,但当涉及到*选定时。它在消息中显示为(null)。知道为什么吗?很可能是因为您忘记在interface builder中连接datePicker属性。您可以通过设置断点并查看它是否为有效对象来进行双重检查。