UITextField通过UIPickerView显示选择内容

好长时间不用，很多技能恢复了初始化状态，今天简单的复习了一下UIPickerView，进行了如下总结，希望可以帮到初学者：

• 使用步骤：

  1. 初始化textField并设置代理
  2. 在代理方法 textFieldDidBeginEditing: 中初始化UIPickerView
  3. 通过触发按钮隐藏UIPickerView，并将UIPickerView选择后内容赋给textField.text

• 代码
  （1）初始化

- (void)viewDidLoad {    [super viewDidLoad];    self.sexTF = [[UITextField alloc] initWithFrame:CGRectMake(50, 80, 100, 40)];    self.sexTF.delegate = self;    self.sexTF.borderStyle = UITextBorderStyleLine;    self.sexTF.textColor = [UIColor blackColor];    self.sexTF.textAlignment = NSTextAlignmentLeft;    self.sexTF.font = [UIFont systemFontOfSize:16];    [self.view addSubview:self.sexTF];    _sexArr = @[@"性别：男",@"性别：女"];}

（2） 实现UITextFieldDelegate

#pragma - mark - UITextFieldDelegate- (void)textFieldDidBeginEditing:(UITextField *)textField{    //隐藏键盘，避免遮挡pickerView    [self.sexTF resignFirstResponder];    [self showSexPickerView];}

（3）初始化PickerView，并实现pickerView相关代理

- (void)showSexPickerView{    //控制pickerView隐藏按钮    UIButton *donePickerBtn = [UIButton buttonWithType:UIButtonTypeCustom];    donePickerBtn.frame = CGRectMake((self.view.frame.size.width-100)/2.0, self.view.frame.size.height - 50, 100, 40);    donePickerBtn.titleLabel.font = [UIFont systemFontOfSize:18];    [donePickerBtn setTitle:@"确定" forState:UIControlStateNormal];    [donePickerBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];    [donePickerBtn addTarget:self action:@selector(hideSexPickerView) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:donePickerBtn];    //pickerView    self.pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 150, self.view.frame.size.width, 200)];    self.pickerView.showsSelectionIndicator=YES;    self.pickerView.delegate=self;    self.pickerView.dataSource=self;    self.pickerView.backgroundColor = [UIColor colorWithWhite:1 alpha:0.8];    self.pickerView.showsSelectionIndicator = YES;    [self.view addSubview:self.pickerView];}#pragma - mark - UIPickerViewDelegate- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{    return _sexArr[row];}#pragma - mark - UIPickerViewDataSource- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView{    return 1;}- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{    return _sexArr.count;}

（4）隐藏pickerView并将选中内容赋值给textField

- (void)hideSexPickerView{    NSInteger row = [self.pickerView selectedRowInComponent:0];    self.sexTF.text = [_sexArr objectAtIndex:row];    [self.pickerView removeFromSuperview];}

实现结果：