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我正在研究一个iPad应用程序,我遇到了委托问题......协议方法没有被调用。我不确定我错过了什么,这里是我的代码。协议方法没有被调用,显示委托'nil'
@protocol pickerLabelProtocol <NSObject>
- (void)selectedPickerData:(UILabel *)sender;
@end
@interface showPickerVC : UIViewController
@property (nonatomic, strong) id <pickerLabelProtocol> delegate;
@end
@implementation showPickerVC
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
//i used breakpoint, the 'delegate' is always nil for some reason?
[self.delegate selectedPickerData:self.mainLabel];
}
----------------------
@interface someViewController : UIViewController <pickerLabelProtocol>
@property (nonatomic, strong) showPickerVC *showPicker;
@end
@implementation someViewController
- (void)selectedPickerData:(UILabel *)sender
{
//protocol method
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.showPicker = [[showPickerVC alloc]init];
self.showPicker.delegate = self;
}
究竟是你想要做什么?你想要访问什么? – Durgaprasad
“ShowPickerVC”是popOver,来自“someViewController”...“ShowPickerVC”有一个选择器,用户在选择器中选择数据,我希望选定的数据被传递给“someViewController”... – DevCali
我是不知道为什么,但这段代码在iPhone中正常工作,但不与iPad可能是因为popOver? – DevCali