iphone常用控件之UIPickerVIew

1.点击按钮触发allcountry事件：

-(void)allcoutry
{
    //界面设计
    picker_background=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    UIImageView *navigationItem=[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"SchoolSearch_AllPleace_navBar.png"]];
    navigationItem.frame=CGRectMake(0, 0, 320, 43);
    [picker_background addSubview:navigationItem];
    [navigationItem release];
    
    UIImage *cancel_image=[UIImage imageNamed:@"SchoolSearch_AllPleace_cancelButton.png"];
    UIButton *cancel=[UIButton buttonWithType:UIButtonTypeCustom];
    cancel.frame=CGRectMake(10, 5.5,55.5, 32.5);
    [cancel setImage:cancel_image forState:UIControlStateNormal];
    [cancel_image release];
    [cancel addTarget:self action:@selector(cancel) forControlEvents:UIControlEventTouchUpInside];
    [cancel setTitle:nil forState:UIControlStateNormal];
    [picker_background addSubview:cancel];
    
    
    UIImage *complete_image=[UIImage imageNamed:@"SchoolSearch_AllPleace_doneButton.png"];
    UIButton *complete=[UIButton buttonWithType:UIButtonTypeCustom];
    complete.frame=CGRectMake(255.5,5.5,55.5,32.5);
    [complete setImage:complete_image forState:UIControlStateNormal];
    [complete_image release];
    [complete addTarget:self action:@selector(complete) forControlEvents:UIControlEventTouchUpInside];
    [picker_background addSubview:complete];
    
    
    //UIPickerView
    picker=[[UIPickerView alloc] initWithFrame:CGRectMake(0, 44, 320,100036)];
    picker.delegate=self;
    picker.showsSelectionIndicator=YES;
    [picker_background addSubview:picker];
    [self.view addSubview:picker_background];
｝

-(void)cancel
{
    [picker_background removeFromSuperview];
}
-(void)complete
{  //显示所选择的区县名
    [picker_background removeFromSuperview];
    if ([Countru_name length]==0) {
        Countru_name = @"全部区县";
    }
    [allcountry setTitle:Countru_name forState:UIControlStateNormal];
 
}

// 返回显示的列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView
{
    return 1;
}
// 返回当前列显示的行数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{

    return [picker_name count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{

    return (NSString *)[picker_name objectAtIndex:row];
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSLog(@"row %d",row);
    pickerRow=row;

    allCountry_id=(NSString *)[picker_nameid objectAtIndex:row];
    Countru_name=(NSString *)[picker_name objectAtIndex:row];   //picker_name 为名字数组
    
}

效果如下：

 


2.点击UITextField触发PIckerView事件：

-(void)viewDidLoad{
   UITextField*  Equeipment=[[UITextField alloc] initWithFrame:CGRectMake(94, 201, 170, 17)];
    Equeipment.font=[UIFont systemFontOfSize:16];
    Equeipment.delegate=self;
    Equeipment.text=@"非常好(5 分)";
    Equeipment.backgroundColor=[UIColor clearColor];
    [self.view addSubview: Equeipment];
    [Equeipment release];
}


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


-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    
    if (textField==qualified_rate) {
        picker_background=[[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
        UIImage *cancel_image=[UIImage imageNamed:@"SchoolSearch_AllPleace_cancelButton.png"];
        UIButton *cancel=[[UIButton alloc]init];
        cancel.frame=CGRectMake(10, 5.5,55.5, 32.5);
        [cancel setImage:cancel_image forState:UIControlStateNormal];
        [cancel addTarget:self action:@selector(cancel) forControlEvents:UIControlEventTouchUpInside];
        [cancel setTitle:nil forState:UIControlStateNormal];
        [picker_background addSubview:cancel];
        [picker release];
        
        
        UIImage *complete_image=[UIImage imageNamed:@"SchoolSearch_AllPleace_doneButton.png"];
        UIButton *complete=[[UIButton alloc] init];
        complete.frame=CGRectMake(255.5,5.5,55.5,32.5);
        [complete setImage:complete_image forState:UIControlStateNormal];
        [complete addTarget:self action:@selector(complete) forControlEvents:UIControlEventTouchUpInside];
        [picker_background addSubview:complete];
        [complete release];
        
        picker=[[UIPickerView alloc] initWithFrame:CGRectMake(0, 44, 320,100036)];
        picker.delegate=self;
        picker.showsSelectionIndicator=YES;
        [picker_background addSubview:picker];
        [self.view addSubview:picker_background];
        [picker_background release];
        
        return NO;
    }
   return YES;
}

-(void)cancel
{
    [picker_background removeFromSuperview];
}
-(void)complete2
{
    Equeipment.text=tempText;
[picker_background removeFromSuperview];
}


#pragma UIPickerView Delegate
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView
{
    return 1;
}
// 返回当前列显示的行数
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [array count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [array objectAtIndex:row];
}
-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    tempText=[array objectAtIndex:row];
    
}