私がやろうとしているのは、同じビューに2つのuipickerを配置することです。どこかで、そのうちの1つに独自のデリゲートが必要であると読みましたが、正しく機能させることができませんでした。
アプリケーションを実行すると、2番目のアプリケーションがコンソールでエラーなしで動作を停止することがあります。
これは、ビューの.hファイルです。
@interface FirstViewController : UIViewController {
IBOutlet UIPickerView *cities;
NSMutableArray *array;
NSString *picked;
}
@property(nonatomic,retain) IBOutlet UIPickerView *cities;
@property(nonatomic,retain) IBOutlet NSMutableArray *array;
そしてここに.mがあります：
@implementation FirstViewController
@synthesize cities,array;
-(void) getCities:(NSString *)link{
url=link;
NSString *str=[[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:url]];
if([str length]==0){
[str release];
return;
}
SBJsonParser *parser=[[SBJsonParser alloc] init];
array=[[parser objectWithString:str] copy];
[receivedData release];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView { // This method needs to be used. It asks how many columns will be used in the UIPickerView
return 1; // We only need one column so we will return 1.
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component { // This method also needs to be used. This asks how many rows the UIPickerView will have.
return [array count]; // We will need the amount of rows that we used in the pickerViewArray, so we will return the count of the array.
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { // what happens when selecting rows
picked=[array objectAtIndex:row];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { //method asks for what the title or label of each row will be
return [array objectAtIndex:row]; // We will set a new row for every string used in the array.
}
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[sv setScrollEnabled:TRUE];
[sv setContentSize:CGSizeMake(320, 800)];
[self getCities:@"any url"];
[super viewDidLoad];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc
{
[super dealloc];
}
@end
2番目のuipickerでは、ビューにnsobjectを追加し、そのクラスを前に作成した「SecondPickerDelegate」に変更しました。これはそのコードです：
.h
#import <UIKit/UIKit.h>
@interface FirstViewSecondPickerDelegate : UIViewController<UIPickerViewDelegate>{
IBOutlet UIPickerView *specialities;
NSMutableArray *array;
NSString *picked;
}
@property(nonatomic,retain) IBOutlet UIPickerView *specialities;
@property(nonatomic,retain) NSMutableArray *array;
@property(nonatomic,retain) NSString *picker;
@end
.mファイル：
#import "FirstViewSecondPickerDelegate.h"
#import "JSON.h"
@implementation FirstViewSecondPickerDelegate
@synthesize specialities,array,picker;
-(void) getSpecialities:(NSString *)link{
url=link;
NSString *str=[[NSString alloc] initWithContentsOfURL:[NSURL URLWithString:url]];
if([str length]==0){
[str release];
return;
}
SBJsonParser *parser=[[SBJsonParser alloc] init];
array=[[parser objectWithString:str] copy];
for(int i=0;i<[array count];i++){
NSLog(@"index %i",i);
NSLog(@"value %@",[array objectAtIndex:i]);
}
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView { // This method needs to be used. It asks how many columns will be used in the UIPickerView
return 1; // We only need one column so we will return 1.
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component { // This method also needs to be used. This asks how many rows the UIPickerView will have.
return [array count]; // We will need the amount of rows that we used in the pickerViewArray, so we will return the count of the array.
}
- (void)pickerView:(UIPickerView *)thePickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { // what happens when selecting rows
picked=[array objectAtIndex:row];
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component { //method asks for what the title or label of each row will be
return [array objectAtIndex:row]; // We will set a new row for every string used in the array.
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
picked=@"1";
[self getSpecialities:@"http://localhost:8080/Test/gs"];
}
return self;
}
/*
-(void) viewDidLoad{
[super viewDidLoad];
}
*/
- (void)dealloc
{
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
誰かがそのような場合の実用的な例を持っているなら、助けてください。