iOS开发编程之UIPickerView

初始化

 

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1. _pickerView = [[UIPickerViewalloc]init];  
2. _pickerView.center =self.view.center;  
3. [self.viewaddSubview:_pickerView];  

 

 

添加数据

  

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1.    
2.   
3. _pickerView.dataSource =self;  
4.   
5. //返回pickerView要显示的组件的条目  
6. - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView  
7. {  
8.      NSInteger result =0;  
9.      if ([pickerViewisEqual:_pickerView]) {  
10.          result = 1;//Figure-2.1  
11.  //      result = 2;//Figure-2.2  
12.      }  
13.      return result;  
14. }  
15.   
16. //返回每个组件的数据条目  
17. - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component  
18. {  
19.    NSInteger result =0;  
20.    if ([pickerViewisEqual:_pickerView]) {  
21.        result = 10;  
22.    }  
23.    return result;  
24. }  
25.   
26.     

 

添加代理

  

   _pickerView.delegate =self;

   //给每个组件的title赋值

   - (NSString *)pickerView:(UIPickerView *)pickerViewtitleForRow:(NSInteger)rowforComponent:(NSInteger)component

   {

      NSString *title=nil;

      if ([pickerViewisEqual:_pickerView]){

          title = [NSStringstringWithFormat:@"Row%ld",(long)row+ 1];

      }

      return title;

   }

显示选中指示：

 _pickerView.showsSelectionIndicator = YES;

选择子项：

1.添加数据源

@interface ViewController (){

   NSArray *pickerDatas;

}

pickerDatas =[NSArrayarrayWithObjects:@"Row1",@"Row2",@"Row3",@"Row4",@"Row5",@"Row6",@"Row7",nil];

2.修改pickerview的返回条目

//返回每个组件的数据条目

- (NSInteger)pickerView:(UIPickerView *)pickerViewnumberOfRowsInComponent:(NSInteger)component

{

   NSInteger result=0;

   if ([pickerViewisEqual:_pickerView]){

       result =[pickerDatascount];

   }

   return result;

}

3.修改pickerview的赋值

//给每个组件的title赋值

- (NSString *)pickerView:(UIPickerView *)pickerViewtitleForRow:(NSInteger)rowforComponent:(NSInteger)component

{

   NSString *title=nil;

   if ([pickerViewisEqual:_pickerView]){

       title =[NSStringstringWithFormat:@"%@",pickerDatas[row]];

   }

   return title;

}

4.添加选中pickerview子项方法

- (void)pickerView:(UIPickerView *)pickerViewdidSelectRow:(NSInteger)rowinComponent:(NSInteger)component

{

   NSString *title=pickerDatas[row];

   UIAlertView *alert= [[UIAlertViewalloc]initWithTitle:@"PickerSelected"message:titledelegate:selfcancelButtonTitle:@"OK"otherButtonTitles:nil,nil];

   

   [alert show];

}