当用户单击UITextField
时,我正在尝试显示UIPickerView
。我还希望UIPickerView
在顶部有一个工具栏,上面有提交选择和取消的按钮。
我需要在接口生成器中连接一个UIPickerView
,还是在其他地方连接一个操作?我在构建时也会收到警告。resignFirstResponder
下方有一条警告。上面写着:
age
的局部声明隐藏实例变量
对于不同的变量,还有几个类似于上面的警告。
另一个警告是:
类"PracticePickerViewController"未实现"UIActionsheetDelegate"协议。
以下是我的.h
和.m
文件:
.h
#import <UIKit/UIKit.h>
@interface PracticePickerViewController : UIViewController <UITextFieldDelegate>{
IBOutlet UITextField *age;
IBOutlet UIPickerView *agePickerView;
IBOutlet UIActionSheet *actionSheet;
IBOutlet UIToolbar *pickerToolbar;
}
@end
.m
#import "PracticePickerViewController.h"
@implementation PracticePickerViewController
-(void)textFieldDidBeginEditing:(UITextField *)age{
[age resignFirstResponder];
actionSheet = [[UIActionSheet alloc] initWithTitle:@"Pick Your Age" delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];
[actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
CGRect pickerFrame = CGRectMake(0,40,0,0);
UIPickerView *agePickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
agePickerView.showsSelectionIndicator = YES;
agePickerView.dataSource = self;
agePickerView.delegate = self;
[actionSheet addSubview:agePickerView];
pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,320,44)];
pickerToolbar.barStyle = UIBarStyleBlackOpaque;
[pickerToolbar sizeToFit];
NSMutableArray *barItems = [[NSMutableArray alloc] init];
UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
[barItems addObject:flexSpace];
UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneButtonPressed:)];
[barItems addObject:doneBtn];
UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelButtonPressed:)];
[barItems addObject:cancelBtn];
[pickerToolbar setItems:barItems animated:YES];
[actionSheet addSubview:pickerToolbar];
[actionSheet addSubview:agePickerView];
[actionSheet showInView:self.view];
[actionSheet setBounds:CGRectMake(0,0,320,485)];
}
年龄的局部声明隐藏实例变量
这意味着您已经定义了一个类变量已经使用的变量名(因此,在这种情况下,您可能已经在类中的某个位置声明了UITextField *age
,但不能在该类中重用变量名age
,因为编译器会将其与类变量混淆)。
类"PracticePickerViewController"未实现"UIActionsheetDelegate"协议。
您尚未将PracticePickerViewController设置为UIActionsheetDelegate
。要做到这一点,您必须将界面标题(PracticePickerViewController.h)更改为:
@interface PracticePickerViewController : UIViewController <UITextFieldDelegate, UIActionsheetDelegate>{
不要忘记实现所需的委托方法!
最后,我强烈建议您查看ActionSheetPicker项目
它是一个插件类,具有您正试图实现的功能,因此您可以用它替换当前代码,也可以将其用作参考,以了解如何在UIPickerView中正确实现嵌入的ActionSheet。希望所有的帮助!