Question

我有一个个人资料表单，作为iOS应用的注册过程的一部分。

我想对性别，标题，DOB等项目使用“下拉”菜单。每个项目的数据都是静态的 - 我将使用UIPickerView来实现 - 但我的问题是 - 我需要创建数组和数据委托来填充每个单独的选择器还是有一种更简单的方法来应用静态数据？

Answer 1

你可以在没有代表的情况下完成吗？否。

没有数组你能做到吗？是的，但你不应该。

这是一个没有数组的示例（来自http://cocoamatic.blogspot.com/2010/08/create-uipickerview-programmatically.html）。

- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {
    // Handle the selection
}

// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    NSUInteger numRows = 3;

    return numRows;
}

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
 return 1;
}

// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    NSString *title;

    title = [@"" stringByAppendingFormat:@"Row %d",row];

    return title;
}

// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
 int sectionWidth = 300;

 return sectionWidth;
}

但是，你真的应该只使用一个数组，这样可以更容易地阅读维护。如果要添加其他值，只需将其添加到阵列即可。只需在数组中添加另一个值，而不是在多个位置进行更新。此外，更容易理解。

@implementation PickerViewController
.
.
- (void)viewDidLoad {
      [super viewDidLoad];
      _myArray = @[@"Row 1", @"Row 2", @"Row 3",];
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {
    // Handle the selection
}

// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    NSUInteger numRows = 3;

    return _myArray.count;
}

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
 return 1;
}

// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    NSString *title;

    title = myArray[row];

    return title;
}

// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
 int sectionWidth = 300;

 return sectionWidth;
}

如果您有多个选择器，您只需使用多个数组并检查每个PickerView，看看自从PickerView传递到列出的每个函数后您拥有了哪个。

@implementation PickerViewController
.
.
- (void)viewDidLoad {
      [super viewDidLoad];
      _myArray1 = @[@"Row 1", @"Row 2", @"Row 3",];
      _myArray2 = @[@"Row 1-2", @"Row 2-2", @"Row 3-2", @"Row 4-2"];      

      UIPickerView pickerView1 = [[UIPickerView alloc] init];
      UIPickerView pickerView2 = [[UIPickerView alloc] init];      
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component {
    // Handle the selection
    if (pickerView == pickerView1)
    {
        // First Picker
    }
    else if (pickerView == pickerView2)
    {
        // First Picker    
    }
}

// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    if (pickerView == pickerView1)
    {
        // First Picker
         return _myArray1.count;
    }
    else if (pickerView == pickerView2)
    {
        // Second Picker    
        return _myArray2.count;
    }    

    // A third picker passed in somehow
    return 0;
}

// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    if (pickerView == pickerView1)
    {
        // First Picker
         return 1;
    }
    else if (pickerView == pickerView2)
    {
        // Second Picker    
        return 1;
    }    

    // A third picker passed in somehow
    return 0;
}

// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    NSString *title;

    if (pickerView == pickerView1)
    {
        // First Picker
         title = myArray1[row];
    }
    else if (pickerView == pickerView2)
    {
        // Second Picker    
        rtitle = myArray2[row];
    }    

    return title;
}

// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
    if (pickerView == pickerView1)
    {
        // First Picker
         return 300;
    }
    else if (pickerView == pickerView2)
    {
        // Second Picker    
        return 400;
    }    

    // A third picker passed in somehow
    return 0;
}

iOS - 填充静态UIPickerView

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