[英]UIPickerView depending on UITableView
我没有太多编程经验,所以这是我的问题:
我正在尝试编写转换器应用程序。 最后,您可以输入一个数字。 然后我有一个双组件UIPickerView
。 使用第一个组件,您可以选择输入格式(ex°Celcius)。 使用第二个组件,您可以选择输出格式(ex°Fahrenheit),以便将°Ccius转换为°华氏度。
但我想增加更多单位(重量,能量等)。 我希望它们显示在UITableView
。 如果我在UITableView
选择某个单元格, UIPickerView
必须更新其委托。 更准确地说,我有单位名称(ex eV,Joule,cal,erg等)的数组必须以某种方式在detailViewController
(我有我的UIPickerView
)中实现。
这是我的代码:
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
<UITableViewDataSource,UITableViewDelegate,UIPickerViewDataSource,UIPickerViewDelegate>
@property (strong,nonatomic) IBOutlet UIPickerView *EinheitenPicker;
@property (weak,nonatomic) IBOutlet UITableView *EinheitenTableView;
@end
#import "ViewController.h"
@interface ViewController ()
{
NSArray *EinheitenNameArray;
}
@end
@implementation ViewController
@synthesize EinheitenPicker,EinheitenTableView;
- (void)viewDidLoad
{
[super viewDidLoad];
EinheitenNameArray=[NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"AlleEinheiten" ofType:@"plist"]];
[self.EinheitenTableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:YES scrollPosition:UITableViewScrollPositionTop];
[self.EinheitenTableView.delegate tableView:self.EinheitenTableView didSelectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
#pragma mark UItableView Delegate
- (NSInteger) numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return EinheitenNameArray.count;
}
- (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier=@"CellId";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell==nil) {
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text=[[EinheitenNameArray objectAtIndex:indexPath.row] objectForKey:@"Titel"];
return cell;
}
- (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//NSLog(@"Chosen:%@",self.EinheitenPicker);
[self.storyboard instantiateViewControllerWithIdentifier:@"TestId"];
[self.EinheitenPicker reloadAllComponents];
}
#pragma mark UIPickerView Methods
- (NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 2;
}
- (NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
NSIndexPath *selectedIndexPath=[self.EinheitenTableView indexPathForSelectedRow];
NSArray *units=[[EinheitenNameArray objectAtIndex:selectedIndexPath.row] objectForKey:@"Einheiten"];
if (component == 0) {
return units.count;
}
return units.count;
}
- (NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
NSIndexPath *selectedIndexPath=[self.EinheitenTableView indexPathForSelectedRow];
NSArray *units=[[EinheitenNameArray objectAtIndex:selectedIndexPath.row] objectForKey:@"Einheiten"];
return [units objectAtIndex:row];
}
@end
如果我没有错,你正在寻找这样的东西。
为此,您必须按如下方式实现UIPickerView方法
-(NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;
}
-(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
NSIndexPath *selectedIndexPath=[self.unitsTableView indexPathForSelectedRow];
NSArray *units=[[unitDataArray objectAtIndex:selectedIndexPath.section] objectForKey:@"units"];
return units.count;
}
-(NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
NSIndexPath *selectedIndexPath=[self.unitsTableView indexPathForSelectedRow];
NSArray *units=[[unitDataArray objectAtIndex:selectedIndexPath.section] objectForKey:@"units"];
return [units objectAtIndex:row];
}
在UITableView Delegate中,您可以按如下方式重新加载选择器视图。
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.unitPicker reloadAllComponents];
}
要为具有组件和单元的表创建项目,可以使用.plist文件,如下所示
为了帮助您使用UITableView方法,我将添加所需的代码。
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
unitDataArray=[NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:<Name of plist File> ofType:@"plist"]];
[self.unitsTableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:YES scrollPosition:UITableViewScrollPositionTop];
[self.unitsTableView.delegate tableView:self.unitsTableView didSelectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
}
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView{
return unitDataArray.count;
}
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
NSDictionary *unitData=[unitDataArray objectAtIndex:section];
return [[unitData objectForKey:@"units"] count];
}
-(UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIdentifier=@"CellId";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell==nil){
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text=[[[unitDataArray objectAtIndex:indexPath.section] objectForKey:@"units"] objectAtIndex:indexPath.row];
return cell;
}
-(NSString*) tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
NSDictionary *unitData=[unitDataArray objectAtIndex:section];
return [unitData objectForKey:@"title"];
}
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.unitPicker reloadAllComponents];
}
更改如果你想让它显示显示如下,需要小的调整,我的代码。
@implementation ViewController
@synthesize unitPicker,unitsTableView;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
unitDataArray=[NSArray arrayWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"AllUnits" ofType:@"plist"]];
[self.unitsTableView selectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0] animated:YES scrollPosition:UITableViewScrollPositionTop];
[self.unitsTableView.delegate tableView:self.unitsTableView didSelectRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:0]];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark UItableView Delegate
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView{
return 1;//Changes 1
}
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return unitDataArray.count;//Changes 2
}
-(UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *cellIdentifier=@"CellId";
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(cell==nil){
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel.text=[[unitDataArray objectAtIndex:indexPath.row] objectForKey:@"title"];
return cell;
}
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.unitPicker reloadAllComponents];
}
#pragma mark UIPicker View Methods
-(NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView{
return 1;//Changes 3
}
-(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
NSIndexPath *selectedIndexPath=[self.unitsTableView indexPathForSelectedRow];
NSArray *units=[[unitDataArray objectAtIndex:selectedIndexPath.row] objectForKey:@"units"];//Changes 4
return units.count;
}
-(NSString*) pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
NSIndexPath *selectedIndexPath=[self.unitsTableView indexPathForSelectedRow];
NSArray *units=[[unitDataArray objectAtIndex:selectedIndexPath.row] objectForKey:@"units"];//Changes 5
return [units objectAtIndex:row];
}
@end
头文件也很简单。
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController <UITableViewDataSource,UITableViewDelegate,UIPickerViewDataSource,UIPickerViewDelegate>
@property (weak,nonatomic) IBOutlet UIPickerView *unitPicker;
@property (weak,nonatomic) IBOutlet UITableView *unitsTableView;
@end
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