UIPickerView 简单介绍

1.UIPickerView效果

2.声明UIPickerView，声明属性

@property(nonatomic,retain)NSArray*proTimeList;

@property(nonatomic,retain)NSArray*proTitleList;

@property(nonatomic,retain)NSString*proTimeStr;

@property(nonatomic,retain)NSString*proNameStr;

UIPickerView*pickerView = [[UIPickerViewalloc]initWithFrame:CGRectMake(0,100,320,216)];

   //显示选中框
    pickerView.showsSelectionIndicator=YES;
    pickerView.dataSource=self;
    pickerView.delegate=self;
    [self.viewaddSubview:pickerView];
    _proTitleList = [[NSArrayalloc]initWithObjects:@"1月",@"2月",@"3月",@"4月",@"5月",@"6月",@"7月",@"8月",@"9月",@"10月",@"11月",@"12月",nil];

    _proTimeList = [[NSArrayalloc]initWithObjects:@"1日",@"2日",@"3日",@"4日",@"5日",@"6日",@"7日",@"8日",@"9日",@"10日",@"11日",@"12日",@"13日",@"14日",@"15日",@"16日",@"17日",@"18日",@"19日",@"20日",@"21日",@"22日",@"23日",@"24日",@"25日",@"26日",@"27日",@"28日",@"29日",@"30日",nil];

3.签协议

<UIPickerViewDelegate,UIPickerViewDataSource>

4.实现方法

// pickerView列数
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView*)pickerView {
    return 2;
}

// pickerView 每列个数
- (NSInteger)pickerView:(UIPickerView*)pickerView numberOfRowsInComponent:(NSInteger)component {
    if (component == 0) {
        return[_proTitleListcount];
    }
   
    return [_proTimeListcount];
}

// 每列宽度
- (CGFloat)pickerView:(UIPickerView*)pickerView widthForComponent:(NSInteger)component {
   
    if (component == 1) {
        return80;
    }
    return 180;
}
// 返回选中的行
- (void)pickerView:(UIPickerView*)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if (component == 0) {

        _proNameStr = [_proTitleListobjectAtIndex:row];

       
    } else {
        _proTimeStr= [_proTimeListobjectAtIndex:row];

    }
   

}

//返回当前行的内容,此处是将数组中数值添加到滚动的那个显示栏上
-(NSString*)pickerView:(UIPickerView*)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    if (component == 0) {
        return[_proTitleListobjectAtIndex:row];
   
    } else {
        return[_proTimeListobjectAtIndex:row];
       
    }
}