我有一个配置文件表单作为iOS应用程序注册过程的一部分.
我想使用一个“下拉”菜单,如性别,标题,DOB等项目.每个数据将是静态的 – 我将使用UIPickerView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,还是有一个更简单的方法来应用静态数据？
解决方法
没有代表你可以做吗？没有.
你可以没有数组吗？是的,但你不应该.
这是一个没有数组的例子(从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;
}
然而,你真的应该使用一个数组,使它更容易阅读维护.如果要添加额外的值,只需将其添加到数组中即可.而不是在多个位置进行更新,只需在数组中添加另一个值即可.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,则只需使用多个数组,并检查每个PickerView,以查看从PickerView传递到列出的每个函数之后的哪一个.
@implementation PickerViewController
.
.
- (void)viewDidLoad {
[super viewDidLoad];
_myArray1 = @[@"Row 1",];
_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;
}
