将UIPickerView的一个组件设置为分隔符

时间:2016-10-04 08:25:33

标签: ios objective-c uipickerview uipickerviewdatasource

我创建了一个十进制数UIPickerView。我希望第二个组件只是一个恒定的点串(。)成为一个分隔符,我的意思是:

1)它不移动

2)它的宽度小于其他组件

3)与其他组件相比,它的颜色不同

enter image description here

以下是代码:

#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?

1 个答案:

答案 0 :(得分:1)

您可以使用UILable并将文本设置为“。” (即Dot),在选择器视图中添加标签。 然后在相关代表中获取3个组件,并为第二个组件返回nil。

以下是代码:

在您的设计方法中,我是在viewDidLoad

中完成的
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];

然后在委托中就像这样

- (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是保留左侧值的数组,arrItemsOthers是保持右侧值的数组

OutPut:

enter image description here

希望有所帮助......

快乐的编码。