在UIAcitionSheet中添加UIPickerView

来源：互联网发布：centos 7 nfs 安装编辑：程序博客网时间：2024/06/11 09:53

首先来看下一下效果图，如下：

在这里，使用到了系统自带的UIActionSheet，熟悉iOS开发的人应该都知道。UIActionSheet是一个底部弹出的选择按钮项控件，可以添加多项，并为每项添加点击事件。它的初始化代码为：

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NSString *title = UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation) ? @
 
 
  
 
 
 
 ;
UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:title
                                                         delegate:self
                                                cancelButtonTitle:@取消
                                           destructiveButtonTitle:nil
                                                otherButtonTitles:@确定,nil];

我们可以看到这里初始化了一个NSString,然后根据屏幕的横竖屏选择使用三目运算符指定填充字符串。这里只用字符换行符作为字符使得UIActionSheet的顶部出现一段空的布局以提供UIDatePicker和UIPickerView使用。

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actionSheet.userInteractionEnabled = YES;
actionSheet.backgroundColor = [UIColor clearColor];
datePicker = [[UIDatePicker alloc] init];
datePicker.tag = 1000;
datePicker.datePickerMode = UIDatePickerModeDate;
[actionSheet addSubview:datePicker];
[actionSheet showInView:self.view];
actionSheet.tag = 100;

上述代码设置UIActionSheet可交互，背景为白色，必须设置背景色，否则可能部分机型会出现显示字符。然后初始化UIDatePicker并绑定tag以提供后面方法调用。紧接着设置日期格式，当然也可以是指日期时间格式。最好通过UIActionSheet的addSubView方法添加到之前我们用换行符占位的布局上，并且使用showInView显示在最上面，同样给UIActionSheet设置一个tag值标记。

以上是添加日期选择器的实现。
同理，地区联动也是一样的实现。不过相对比较复杂。这里不做详细介绍了。直接贴出实现部分。

plist文件就是普通的国内各省市，直辖市区县的信息，目前并不是很完善，本人地理知识有限，需要不断优化添加。

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#pragma mark - 调用地区联动方法
- (void)showAreaPickerView{
    // 加载plist文件，初始化三个NSArray对象，然后做一些非法的事情，你懂的
    provinces = [[NSArray alloc] initWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@area.plist ofType:nil]];
    cities = [[provinces objectAtIndex:0] objectForKey:@cities];
    state = [[provinces objectAtIndex:0] objectForKey:@state];
    NSString *title = UIDeviceOrientationIsLandscape([UIDevice currentDevice].orientation) ? @
 
 
 
 
 
 
 
 
 : @
 
 
 
 
 
 
 
 
 
 
 
 ;
    UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:title
                                                             delegate:self
                                                    cancelButtonTitle:@取消
                                               destructiveButtonTitle:nil
                                                    otherButtonTitles:@确定,nil];
    actionSheet.userInteractionEnabled = YES;
    actionSheet.backgroundColor = [UIColor clearColor];
    areaPicker = [[UIPickerView alloc] init];
    areaPicker.dataSource = self;
    areaPicker.delegate = self;
     
    [actionSheet addSubview:areaPicker];
    [actionSheet showInView:self.view];
    actionSheet.tag = 200;
}

接下来是UIPickerViewDataSource数据源方法和UIPickerViewDelegate代理方法。部分地方仍然可以精简。

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// UIPickerViewDataSource中定义的方法，该方法的返回值决定改控件包含多少列
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return3;// 返回3 表明什么呢？这个如果你不知道，你就别干了、、、表明该控件只包含3列，3列也就够了啊
}
// UIPickerViewDataSource中定义的方法，该方法的返回值决定该控件指定列包含多少哥列表项
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    // 如果是第一列，返回provinces的个数
    // 也就是provinces包含多少个元素，大天朝有多少个省份里面就有多少个
    if(component == 0) {
        returnprovinces.count;
    }elseif(component == 1){
        // 如果是第二列，返回cities的个数
        returncities.count;
    }else{
        returnareas.count;
    }
}
// UIPickerViewDelegate中定义的方法，该方法返回NSString将作为UIPickerView中指定列和列表项上显示的标题
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    // 如果是第一列，返回provinces中row索引出得元素
    switch(component) {
        case0:
            return[[provinces objectAtIndex:row] objectForKey:@state];
            break;
        case1:
            return[[cities objectAtIndex:row] objectForKey:@city];
            break;
        case2:
            return[areas objectAtIndex:row];
            break;
        default:
            return@;
            break;
    }
}
// 当用户选中UIPickerViewDataSource中指定列和列表项时激发该方法
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    switch(component) {
        case0:
            cities = [[provinces objectAtIndex:row] objectForKey:@cities];
            [self.areaPicker selectRow:0inComponent:1animated:YES];
            [self.areaPicker reloadComponent:1];
             
            areas = [[cities objectAtIndex:0] objectForKey:@areas];
            [self.areaPicker selectRow:0inComponent:2animated:YES];
            [self.areaPicker reloadComponent:2];
             
            state = [[provinces objectAtIndex:row] objectForKey:@state];
            city = [[cities objectAtIndex:0] objectForKey:@city];
            if([areas count] > 0) {
                district = [areas objectAtIndex:0];
            }else{
                district = @;
            }
            break;
        case1:
            areas = [[cities objectAtIndex:row] objectForKey:@areas];
            [self.areaPicker selectRow:0inComponent:2animated:YES];
            [self.areaPicker reloadComponent:2];
             
            city = [[cities objectAtIndex:row] objectForKey:@city];
            if([areas count] > 0) {
                district = [areas objectAtIndex:0];
            }else{
                district = @;
            }
            break;
        case2:
            if([areas count] > 0) {
                district = [areas objectAtIndex:row];
            }else{
                district = @;
            }
            break;
    }
}

具体逻辑实现可能有一些小细节处理的不好，但实际使用还是很棒的。这里就不贴动态gif图了。本篇到此为止。

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