UIPickView

最新推荐文章于 2020-09-16 16:32:21 发布

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最新推荐文章于 2020-09-16 16:32:21 发布

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原文链接：http://www.cnblogs.com/fantasy3588/p/5036135.html

本文介绍如何使用 iOS 中的 UIPickerView 控件创建一个选择器。通过设置数据源和代理，可以实现自定义的选择列表，并展示了如何根据不同的组件设置宽度及获取所选的值。

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// 选择框
    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 100, 320, 216)];
    // 显示选中框
    pickerView.showsSelectionIndicator=YES;
    pickerView.dataSource = self;
    pickerView.delegate = self;
    [self.view addSubview:pickerView];
    [pickerView release];
        _proTimeList = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",nil];
    _proTitleList = [[NSArray alloc]initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"10",nil
 
 
// 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 [_proTitleList count];
    }
     
    return [_proTimeList count];
}
 
// 每列宽度
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
     
    if (component == 1) {
        return 40;
    }
    return 180;
}
// 返回选中的行
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    if (component == 0) {
        _proNameStr = [_proTitleList objectAtIndex:row];
    } else {
        _proTimeStr = [_proTimeList objectAtIndex: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 [_proTitleList objectAtIndex:row];
    } else {
        return [_proTimeList objectAtIndex:row];
 
    }
}