点击完成（具有多个选择器）时如何在uipickerview中获取当前选定的行

Question

我的应用程序中的UIPickerview运行正常。

我想更改UIPickerview的默认选择行为，我的意思是我在UIToolbar有一个完成按钮。 工具栏将添加到UIPickerview 。

每当用户点击“完成”按钮时，我都希望选中突出显示的条目。 这意味着用户可以上下移动，当用户点击“完成”按钮时，我现在要考虑选择

请让我知道，点击“完成”按钮后，如何获取UIPickerview当前选择的行

注意：我的视图中有3个选择器（我的意思是我想有pickerview标记和pickerview选中的行）

Answer 1

selectedRowInComponent：

- Returns the index of the selected row in a given component.
- (NSInteger)selectedRowInComponent:(NSInteger)component

参数component零索引数字，标识选择器视图的组成部分。 返回值零索引的数字，标识选定的行；如果未选择任何行，则为-1。

求助

为了使不同的pickerView有所不同，请向每个picker添加标签：

 self.pikcerView.tag = 1;

希望这可以帮助。

Answer 2

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    NSString *str = [yourarray objectAtIndex:row];   
}

现在str具有选定的值。 因此您可以在完成按钮按下后使用它。

Answer 3

//假设您已经创建了三个选择器视图，分别是firstPickerView，secondPickerView和ThirdPickerView

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if(pickerView == firstPickerView)
    {
        NSString *strFirstPickerView = [yourarray objectAtIndex:row];
    }
    else if(pickerView == secondPickerView)
    {
        NSString *strSecondPickerView = [yourarray objectAtIndex:row];
    }
    else
    {
        NSString *strThirdPickerView = [yourarray objectAtIndex:row];
    }
}

Answer 4

UIPickerview控制器的以下示例

.m文件在这里

#import "SingleComponentPickerViewController.h"
@implementation SingleComponentPickerViewController
@synthesize singlePicker;
@synthesize pickerData;

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    }
    return self;
}

-(IBAction)buttonPressed1
{
    NSInteger row = [singlePicker selectedRowInComponent:0];
    NSString *selected = [pickerData objectAtIndex:row];
    NSString *title = [[NSString alloc] initWithFormat:
                       @"you selected %@!", selected];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:title
                                                   message : @"Thank you for choosing."
                                                   delegate:nil
                                         cancelButtonTitle :@"Welcome"             
                                         otherButtonTitles :nil];
    [alert show];
    [alert release];
    [title release];
}

- (void)viewDidLoad {


    NSArray *array = [[NSArray alloc] initWithObjects:@"iPhone",@"iPad",@"iPod",@"iMac",@"Mac",
                      @"iBook",@"Safari",nil];
    self.pickerData = array;
    [array release];
    [super viewDidLoad];
}


- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

- (void)viewDidUnload {
}


- (void)dealloc {
    [singlePicker release];
    [pickerData release];
    [super dealloc];
}

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

-(NSInteger)pickerView:(UIPickerView *)pickerView
numberOfRowsInComponent:(NSInteger)component
{
    return [pickerData count];
}

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


@end

和.h文件在这里

#import <UIKit/UIKit.h>

@interface SingleComponentPickerViewController : UIViewController {
    IBOutlet UIPickerView *singlePicker;
    NSArray *pickerData;
}
@property(nonatomic , retain) UIPickerView *singlePicker;
@property(nonatomic , retain) NSArray *pickerData;

-(IBAction)buttonPressed1;

@end

快乐编码@samuel