我正在创建UIPickerView
programatically
并添加了自定义button
,当用户按下button
时,picker
将无法显示。但是当我按下button
时,它甚至没有调用selector
method
。我知道这个问题在这个网站上有很多答案,但它并没有解决我的问题。
-(void) funtion
{
self.myPickerView = [[UIPickerView alloc]init];
self.myPickerView.dataSource = self;
self.myPickerView.delegate = self;
self.myPickerView.showsSelectionIndicator = YES;
self.myPickerView.frame = CGRectMake(0, 417, 320, 151);
[self.myPickerView setBackgroundColor:[UIColor whiteColor]];
UIToolbar *toolBar= [[UIToolbar alloc] initWithFrame:CGRectMake(0,0,320,44)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithTitle:@"Done"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(donePressed:)];
toolBar.items = [[NSArray alloc] initWithObjects:barButtonDone,nil];
barButtonDone.tintColor=[UIColor blackColor];
[self.myPickerView addSubview:toolBar];
[self.view addSubview:self.myPickerView];
}
-(void)donePressed:(id)sender
{
[self.myPickerView endEditing:YES];
}
答案 0 :(得分:3)
例如我添加此
<强>步骤1 强>
创建一个UIPicker
,UItextField
和NSArray以加载详细信息
@interface ViewController ()<UITextFieldDelegate,UIPickerViewDataSource,UIPickerViewDelegate>
{
UITextField *myTextField;
UIPickerView *myPickerView;
NSArray *pickerArray;
}
@end
<强>步骤-2 强>
在ViewDidLoad
上调用选择器方法
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self addPickerView];
}
<强>步骤-3 强>
create the picker, textfield and done button
-(void)addPickerView{
pickerArray = [[NSArray alloc]initWithObjects:@"Chess",
@"Cricket",@"Football",@"Tennis",@"Volleyball", nil];
myTextField = [[UITextField alloc]initWithFrame:
CGRectMake(10, 100, 300, 30)];
myTextField.borderStyle = UITextBorderStyleRoundedRect;
myTextField.textAlignment = NSTextAlignmentCenter;
myTextField.delegate = self;
[self.view addSubview:myTextField];
[myTextField setPlaceholder:@"Pick a Sport"];
myPickerView = [[UIPickerView alloc]init];
myPickerView.dataSource = self;
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc]
initWithTitle:@"Done" style:UIBarButtonItemStyleDone
target:self action:@selector(done:)];
UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:
CGRectMake(0, self.view.frame.size.height-
myPickerView.frame.size.height-50, 320, 50)];
[toolBar setBarStyle:UIBarStyleBlackOpaque];
NSArray *toolbarItems = [NSArray arrayWithObjects:
doneButton, nil];
[toolBar setItems:toolbarItems];
myTextField.inputView = myPickerView;
myTextField.inputAccessoryView = toolBar;
}
<强>步骤4 强>
如果用户按下完成按钮,则重新选择选择器
-(void)done:(id)sender
{
[myTextField resignFirstResponder];
}
<强>步骤5 强>
PickerView委托方法
#pragma mark - Picker View Data source
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component{
return [pickerArray count];
}
#pragma mark- Picker View Delegate
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:
(NSInteger)row inComponent:(NSInteger)component{
[myTextField setText:[pickerArray objectAtIndex:row]];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:
(NSInteger)row forComponent:(NSInteger)component{
return [pickerArray objectAtIndex:row];
}
这里我附上了sample project
示例输出
<强>更新强>
如果您使用了隐藏的按钮,则选择器视图使用此
-(void)donePressed:(id)sender
{
[self.myPickerView removeFromSuperview];
}
按下按钮时调用此方法
[self funtion];
答案 1 :(得分:0)
像这样添加完成按钮: -
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 0, 40, 50);
[doneButton addTarget:self action:@selector(donePressed:) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *barButtonDone = [[UIBarButtonItem alloc] initWithCustomView:logoButton];
toolBar.items = [[NSArray alloc] initWithObjects:barButtonDone,nil];
barButtonDone.tintColor=[UIColor blackColor];
[self.myPickerView addSubview:toolBar];
答案 2 :(得分:0)
将工具栏作为inputAccessoryView添加到文本字段,
// Tool bar
UIToolbar *pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width,35)];
pickerToolbar.barStyle = UIBarStyleDefault;
// Bar button
UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(pickerDoneButtonTapped:)];
UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
[pickerToolbar setItems:@[flexSpace,doneButton]];
self.selectedLockerTextFiled.inputAccessoryView = pickerToolbar;
self.selectedLockerTextFiled.inputView = picker;