IOS拾取器piker多组件实例

作者：朱克锋

邮箱：zhukefeng@iboxpay.com

转载请注明出处：http://blog.youkuaiyun.com/linux_zkf

piker在IOS开发中有着广泛的应用，这里实现的是多组件的piker，实现piker需要遵从piker的数据源与代理协议

UIPickerViewDelegate, UIPickerViewDataSource

示例效果如图

头文件

#import <UIKit/UIKit.h>

#define F_C   0

#define S_C   1

@interface DoubleComponentPickerViewController : UIViewController

<UIPickerViewDelegate, UIPickerViewDataSource>

{

    UIPickerView *doublePicker;

    NSArray *upCaseTypes;

    NSArray *lowCaseTypes;

}

@property(nonatomic, retain) IBOutlet UIPickerView *doublePicker;

@property(nonatomic, retain) NSArray *upCaseTypes;

@property(nonatomic, retain) NSArray *lowCaseTypes;

-(IBAction)buttonPressed;

@end

#import "DoubleComponentPickerViewController.h"

@implementation DoubleComponentPickerViewController

@synthesize doublePicker;

@synthesize upCaseTypes;

@synthesize lowCaseTypes;

-(IBAction)buttonPressed

{

    NSInteger upCaseRow = [doublePicker selectedRowInComponent:

F_C];

    NSInteger lowCaseRow = [doublePicker selectedRowInComponent:

                          S_C];

    NSString *lowCase = [lowCaseTypes objectAtIndex:lowCaseRow];

    NSString *upCase = [upCaseTypes objectAtIndex:upCaseRow];

}

- (void)viewDidLoad {

    NSArray *upCaseArray = [[NSArray alloc] initWithObjects:@"A",

@"B", @"C", @"D",

@"E", @"F", @"G", nil];

    self.upCaseTypes = upCaseArray;

    [upCaseArray release];

    NSArray *lowCaseArray = [[NSArray alloc] initWithObjects:@"a",

  @"b", @"c", @"d", @"e",@"f", @"g",nil];

    self.lowCaseTypes = lowCaseArray;

    [lowCaseArray release];

}

#pragma mark -

#pragma mark Picker Data Source Methods

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {

    return 2;

}

- (NSInteger)pickerView:(UIPickerView *)pickerView

numberOfRowsInComponent:(NSInteger)component {

    if (component == F_C)

        return [self.lowCaseTypes count];

    return [self.upCaseTypes count];

}

#pragma mark Picker Delegate Methods

- (NSString *)pickerView:(UIPickerView *)pickerView

titleForRow:(NSInteger)row

forComponent:(NSInteger)component {

    if (component == S_C)

        return [self.lowCaseTypes objectAtIndex:row];

    return [self.upCaseTypes objectAtIndex:row];

}