UIPickerView看起来像UIDatePicker但有秒 [英] UIPickerView that looks like UIDatePicker but with seconds

问题描述

我正在制作计时器应用，需要向用户显示小时，分钟和秒。我尝试使用 UIDatePicker ，但它只显示小时和分钟作为选择。不是秒。在网上做了一些研究之后，我发现在 UIDatePicker 中无法获得秒数，我必须自己编写 UIPickerView 从头开始。

I am making a timer app and needed to display hour, min and seconds to the user. I tried using UIDatePicker but it shows only hours and mins as selections. Not seconds. After doing a bit of research online I found that there is no way to get seconds in UIDatePicker and I had to write my own UIPickerView from scratch.

所以我的问题是，是否有这样的示例代码，即有人写了一个 CustomUIPickerView for hours，min和secs我可以在我的项目中加入？ UIDatePicker 有一个很好的覆盖时间&在用户旋转拨号时保留的文本。如果有人在他们的自定义选择器中添加它，那将是很好的。如果我不需要，我不想从头开始编写自定义 UIPickerView 。谢谢。

So my question is, is there sample code for such i.e. someone wrote a CustomUIPickerView for hours, min and secs that I can incorporate in my project? UIDatePicker has a nice overlay of Hours & Mins text that stays put while the user rotate the dials. It would be nice if someone added that in their custom picker too. I prefer not to write a custom UIPickerView from scratch if I don't have to. Thank you.

推荐答案

好的人，这里是你的获得小时/分钟/秒的代码UIPickerView 。您可以添加3个标签，策略性地将它们放在选取器上。我也附上了一张照片。

Alrighty folks, here is the code to get hours/mins/secs in your UIPickerView. You can add 3 labels an strategically place them on the picker. I have attached a picture as well.

如果你喜欢这个答案，请给它评分吧！优秀的开发人员分享知识并不像有些人建议那样隐藏它玩得开心！

If you like the answer do rate it up! Good developers share knowledge not hide it like some people suggested. Have fun coding!

在你的标题.h文件中放这个

In your header .h file put this

@interface v1AddTableViewController : UITableViewController
{

    IBOutlet UIPickerView *pickerView;    
    NSMutableArray *hoursArray;
    NSMutableArray *minsArray;
    NSMutableArray *secsArray;

    NSTimeInterval interval;

}

@property(retain, nonatomic) UIPickerView *pickerView;
@property(retain, nonatomic) NSMutableArray *hoursArray;
@property(retain, nonatomic) NSMutableArray *minsArray;
@property(retain, nonatomic) NSMutableArray *secsArray;

这个

@synthesize pickerView;
@synthesize hoursArray;
@synthesize minsArray;
@synthesize secsArray;
@synthesize interval;

- (void)viewDidLoad
{
    [super viewDidLoad];


    //initialize arrays
    hoursArray = [[NSMutableArray alloc] init];
    minsArray = [[NSMutableArray alloc] init];
    secsArray = [[NSMutableArray alloc] init];
    NSString *strVal = [[NSString alloc] init];

    for(int i=0; i<61; i++)
    {
        strVal = [NSString stringWithFormat:@"%d", i];

        //NSLog(@"strVal: %@", strVal);

        //Create array with 0-12 hours
        if (i < 13)
        {
            [hoursArray addObject:strVal];
        }

        //create arrays with 0-60 secs/mins
        [minsArray addObject:strVal];
        [secsArray addObject:strVal];
    }


    NSLog(@"[hoursArray count]: %d", [hoursArray count]);
    NSLog(@"[minsArray count]: %d", [minsArray count]);
    NSLog(@"[secsArray count]: %d", [secsArray count]);

}


//Method to define how many columns/dials to show
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 3;
}


// Method to define the numberOfRows in a component using the array.
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent :(NSInteger)component 
{ 
    if (component==0)
    {
        return [hoursArray count];
    }
    else if (component==1)
    {
        return [minsArray count];
    }
    else
    {
        return [secsArray count];
    }

}


// Method to show the title of row for a component.
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{

    switch (component) 
    {
        case 0:
            return [hoursArray objectAtIndex:row];
            break;
        case 1:
            return [minsArray objectAtIndex:row];
            break;
        case 2:
            return [secsArray objectAtIndex:row];
            break;    
    }
    return nil;
}


-(IBAction)calculateTimeFromPicker
{

    NSString *hoursStr = [NSString stringWithFormat:@"%@",[hoursArray objectAtIndex:[pickerView selectedRowInComponent:0]]];

    NSString *minsStr = [NSString stringWithFormat:@"%@",[minsArray objectAtIndex:[pickerView selectedRowInComponent:1]]];

    NSString *secsStr = [NSString stringWithFormat:@"%@",[secsArray objectAtIndex:[pickerView selectedRowInComponent:2]]];

    int hoursInt = [hoursStr intValue];
    int minsInt = [minsStr intValue];
    int secsInt = [secsStr intValue];


    interval = secsInt + (minsInt*60) + (hoursInt*3600);

    NSLog(@"hours: %d ... mins: %d .... sec: %d .... interval: %f", hoursInt, minsInt, secsInt, interval);

    NSString *totalTimeStr = [NSString stringWithFormat:@"%f",interval];

}

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