将 UIPickerView 的组件设置为分隔符

Question

我创建了一个十进制数 UIPickerView。我希望第二个组件只是一个常量点字符串 (.) 成为分隔符，我的意思是：

1) 不动

2) 其宽度小于其他组件

3) 与其他组件相比颜色不同

代码如下：

#pragma mark - UIPickerView : Datasource Protocol
-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 3;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {    if(component == 2)
        return 10;
    if(component == 1)
        return 1;
    else
        return 1000;
}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    if(component == 1)
        return @".";
    else
        return [NSString stringWithFormat:@"%ld", (long)row];

}

我该怎么做？

Answer 1

您可以取 UILable 并将文本设置为“.” （即点），在选择器视图中添加标签。然后在相关委托中取 3 个组件，第二个组件 return nil.

这是代码：

按照你的设计方法，我在viewDidLoad

myPickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0, 200, 320, 200)];
myPickerView.delegate = self;
myPickerView.showsSelectionIndicator = YES;
[self.view addSubview:myPickerView];

label = [[UILabel alloc] initWithFrame:CGRectMake(145, 76, 36, 36)];
label.font = [UIFont boldSystemFontOfSize:40];
label.layer.cornerRadius = 18.0;
label.layer.masksToBounds = YES;
label.text = @".";
[label setTextColor:[UIColor darkGrayColor]];
label.backgroundColor = [UIColor clearColor];
label.textAlignment = NSTextAlignmentCenter;
label.shadowColor = [UIColor whiteColor];
label.shadowOffset = CGSizeMake (0,1);
[myPickerView addSubview:label];

那么在delegate中就是这样

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if (component ==0) {
        return self.arrItemsTop.count;
    }else if (component == 1){
        return 0;
    }else
        return self.arrItemsOther.count;

}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {

    if (component == 0) {
        return self.arrItemsTop[row];
    }
    else if (component == 1){
        return nil;
    }
    else{
        return self.arrItemsOther[row];
    }
}

注意：arrItemsTop 是保存左侧值的数组，arrItemsOthers 是保存右侧值的数组

输出：

希望对您有所帮助..

编码愉快。

将 UIPickerView 的组件设置为分隔符

set a component of UIPickerView as a separator

objective-c

uipickerview

ios

uipickerviewdatasource