UIPickerView的使用

UITextField点击之后弹出UIPickerView，用PickerView覆盖键盘。去除第一响应。

闲话不多，直接上代码

定义：

@interface AddlandroidViewController () <UITextFieldDelegate,UIPickerViewDataSource,UIPickerViewDelegate>

@property (nonatomic, strong) UITextField *landroidNameTF;
@property (nonatomic, strong) UITextField *landroidNumberTF;
@property (nonatomic, strong) UIButton *donePickerBtn;
@property (strong, nonatomic) UIPickerView *landroidPicker;

布局pick view

-(UIPickerView *) landroidPicker{

    if (!_landroidPicker) {
        _landroidPicker = [[UIPickerView alloc] init];
        self.landroidArray = [NSMutableArray arrayWithArray:@[NSLocalizedString(@"Landroid S WR102SI", nil),NSLocalizedString(@"Landroid S WR102SI.1", nil),NSLocalizedString(@"Landroid S WR103SI", nil),NSLocalizedString(@"Landroid S WR103SI.1", nil),NSLocalizedString(@"Landroid S WR104SI", nil),
                                                              NSLocalizedString(@"Landroid S WR104SI.1", nil),NSLocalizedString(@"Landroid S WR105SI", nil),NSLocalizedString(@"Landroid S WR105SI.1", nil),NSLocalizedString(@"Landroid S WR106SI", nil),NSLocalizedString(@"Landroid S WR106SI.1", nil),NSLocalizedString(@"Landroid S WR110SI", nil),NSLocalizedString(@"Landroid S WR110SI.1", nil),NSLocalizedString(@"Landroid S WR111SI", nil),]];
        self.landroidPicker.dataSource = self;
        self.landroidPicker.delegate = self;
        [self.landroidPicker selectRow:0 inComponent:0 animated:YES];
        [self.view addSubview:_landroidPicker];

        NSString *deviceType = [UIDevice currentDevice].model;
        if([deviceType isEqualToString:@"iPhone"]) {
            //iPhone
            [self.landroidPicker mas_makeConstraints:^(MASConstraintMaker *make) {
                make.height.mas_equalTo(ScreenHeight * 0.35);
                make.width.mas_equalTo(ScreenWidth);
                make.centerX.equalTo(self.view.mas_centerX);
                make.top.equalTo(self.view.mas_top).offset(ScreenHeight * 0.05 + 344 + 64);
            }];
        }else if([deviceType isEqualToString:@"iPad"]) {
            //iPad
            [self.landroidPicker mas_makeConstraints:^(MASConstraintMaker *make) {
                make.height.mas_equalTo(ScreenHeight * 0.35);
                make.width.mas_equalTo(ScreenWidth);
                make.centerX.equalTo(self.view.mas_centerX);
                make.top.equalTo(self.view.mas_top).offset(ScreenHeight * 0.01 + 344 + 64);
            }];
        }

    }
    return _landroidPicker;
}

//自定义pick view的字体和颜色
-(UIView *) pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view{
    UILabel* pickerLabel = (UILabel*)view;
    if (!pickerLabel){
        pickerLabel = [[UILabel alloc] init];
        [pickerLabel setTextAlignment:NSTextAlignmentCenter];
        [pickerLabel setBackgroundColor:[UIColor clearColor]];
        [pickerLabel setFont:[UIFont boldSystemFontOfSize:18]];
        pickerLabel.textColor = [UIColor whiteColor];
    }
    // Fill the label text here
    pickerLabel.text=[self pickerView:pickerView titleForRow:row forComponent:component];
    return pickerLabel;
}

代理：

#pragma mark - UIPickerViewDataSource

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    
    return 1;
}

- (CGFloat)pickerView:(UIPickerView *)pickerView rowHeightForComponent:(NSInteger)component __TVOS_PROHIBITED {
    
    return 40;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    
    return self.landroidArray.count;
    
}

#pragma mark - UIPickerViewDelegate
- (nullable NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    
    return self.landroidArray[row];
    
}
#pragma mark - UIUITextField action

-(void)textFieldTextChange{
    
}

#pragma mark - resign keyboard control

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    [self.landroidNameTF resignFirstResponder];
    [self.landroidNumberTF resignFirstResponder];
    
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    [self.landroidNameTF resignFirstResponder];
    [self.landroidNumberTF resignFirstResponder];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField{
    [textField resignFirstResponder];
    return YES;
}

#pragma mark - UITextFieldDelegate
- (void)textFieldDidBeginEditing:(UITextField *)textField{
    if (_landroidNameTF == textField) {

        _landroidPicker = [self landroidPicker];
        [self.landroidNameTF resignFirstResponder];
        _landroidPicker.hidden = NO;
        //控制pickerView隐藏按钮
        _donePickerBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        _donePickerBtn.titleLabel.font = [UIFont systemFontOfSize:18];
        [_donePickerBtn setTitle:LocalString(@"Done") forState:UIControlStateNormal];
        [_donePickerBtn setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [_donePickerBtn addTarget:self action:@selector(hidePickerView) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:_donePickerBtn];
        [_donePickerBtn mas_makeConstraints:^(MASConstraintMaker *make) {
            make.size.mas_equalTo(CGSizeMake(100/WScale, 40/HScale));
            make.right.equalTo(self.view.mas_right).offset(-30);
            make.top.equalTo(self.nextBtn.mas_bottom).offset(50);
        }];
    }
    
}

- (void)hidePickerView{
    NSInteger row = [self.landroidPicker selectedRowInComponent:0];
    self.landroidNameTF.text = [_landroidArray objectAtIndex:row];
    _landroidPicker.hidden = YES;
    //[self.landroidPicker removeFromSuperview];
    [self.donePickerBtn removeFromSuperview];
    
}