IOS之UIPickView的使用

1

//初始化：

2	TimesPickerView = [[UIPickerView alloc] initWithFrame:CGRectZero];

3	CGRect pickerRect = CGRectMake(w, h, x, y);

4	TimesPickerView.frame = pickerRect;

5	TimesPickerView.showsSelectionIndicator = YES;

6	[TimesPickerView setBackgroundColor:[UIColor clearColor]];

7	TimesPickerView.autoresizingMask = UIViewAutoresizingFlexibleWidth;

8	TimesPickerView.delegate=self;  //设置委托

9	[self.view  addSubview:TimesPickerView];

Picker View需要两个接口：DataSource和Delegate。
在定义接口的地方要有如下定义:

一个类必须至少实现下列方法：

01	@interface SingleComponentPickerViewController : UIViewController

02	<uipickerviewdelegate, uipickerviewdatasource="">

03

04	#pragma mark -

05	#pragma mark Picker Data Source Methods

06

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

08

{

09

return 1;

10

}

11

12	- (NSInteger) pickerView: (UIPickerView *)pickerView

13	numberOfRowsInComponent: (NSInteger) component

14

{

15	return [pickerData count];

16

}

17

18	#pragma mark Picker Delegate Methods

19	- (NSString *) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger) row

20	forComponent:(NSInteger) component{

21	return [pickerData objectAtIndex:row];

22

}

23	</uipickerviewdelegate,>

其中Data Source提供了数据，而Delegate则实际获取数据。

如果要接收某个Component被选择的消息，则要实现一个delegate方法:

view source

print ?

01	- (void) pickerView:(UIPickerView *) pickerView

02	didSelectRow: (NSInteger) row

03	inComponent: (NSInteger) component{

04	if (component == kStateComponent) {

05	NSString *selectedState = [self.states objectAtIndex:row];

06	NSArray *array = [stateZips objectForKey:selectedState];

07	self.zips = array;

08	[picker selectRow:0 inComponent: kZipComponent animated:YES];

09	[picker reloadComponent:kZipComponent];

10

}

11

}

12

13

//触发事件

14	- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {

15	[pickerViewsarray objectAtIndex:row];

16	switch (row) {

17

case 0:

18	NSLog(@"row:%d",row);

19

break;

20

case 1:

21	NSLog(@"row:%d",row);

22

break;

23

}