我已在UIPickerView中实现了以下显示响应数据的代码。它在我运行应用程序时崩溃了。如何解决问题？
- (void)viewDidLoad {
[super viewDidLoad];
self.view.frame=CGRectMake(0, 0, 320, 480);
materialarray = [[NSMutableArray alloc] init];
[picbutton setTitle:[materialarray objectAtIndex:0] forState:UIControlStateNormal];
[self testing];
}
-(IBAction)picbuttonaction:(id)sender{
NSLog(@"unitpiker");
[enterVal1 resignFirstResponder];
[enterVal2 resignFirstResponder];
str = picbutton.currentTitle;
UIActionSheet *menu = [[UIActionSheet alloc] initWithTitle:nil
delegate:self
cancelButtonTitle:@"Done"
destructiveButtonTitle:nil
otherButtonTitles:nil];
Picker = [[UIPickerView alloc] init];
Picker.tag = 1;
Picker.showsSelectionIndicator = YES;
Picker.dataSource = self;
Picker.delegate = self;
[Picker selectRow:j inComponent:0 animated:YES];
[menu addSubview:Picker];
[menu showInView:self.view];
[menu sendSubviewToBack:Picker];
[menu setBounds:CGRectMake(0,0,320, 300)];
CGRect pickerRect = Picker.bounds;
Picker.bounds = pickerRect;
[Picker release];
[menu release];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView;
{
if (pickerView.tag==1) {
return 1;
}
if(pickerView.tag==2){
return 1;
}
return 0;
}
-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
if (pickerView.tag==1){
return [materialarray count];
}
if(pickerView.tag==2){
return [array_preferences count];
}
return 0;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component;
{
if (pickerView.tag==1) {
return [materialarray objectAtIndex:row];
}
if(pickerView.tag==2){
return [array_preferences objectAtIndex:row];
}
return 0;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component;
{
j=row;
[picbutton setTitle:[materialarray objectAtIndex:row] forState:UIControlStateNormal];
}
-(IBAction)Resetbuttonaction{
[picbutton setTitle:[materialarray objectAtIndex:0] forState:UIControlStateNormal];
j=0;
}
-(void)testing{
NSString *jobSearchUrlString = [NSString stringWithFormat:@"http://infra2appsmobile.cloudapp.net/Infra2Apps.svc/Contacts"];
//NSLog(@"url for new articles is = %@",jobSearchUrlString);
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:jobSearchUrlString]];
NSURLConnection *theconnection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
if (theconnection) {
RoutData = [[NSMutableData alloc] init];
}
}
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[RoutData setLength: 0];
}
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[RoutData appendData:data];
NSString *thexml = [[NSString alloc] initWithData:RoutData encoding:NSUTF8StringEncoding];
NSDictionary *dictXML= [XMLReader dictionaryForXMLString:thexml error:nil];
NSMutableArray *arrStation = [[dictXML objectForKey:@"feed"] objectForKey:@"entry"] ;//this would
for (int i=0; i<[arrStation count]; i++){
str=[[[[[arrStation objectAtIndex:i] objectForKey:@"content"] objectForKey:@"m:properties"] objectForKey:@"d:ContactName"] objectForKey:@"text"];
// NSlog(@"name is : %@",str);
[materialarray addObject:str];
[Picker reloadAllComponents];
NSLog(@"name is->>>>>>> : %@",materialarray);
}
/
}
当我运行应用程序时，它会显示：
2012-03-03 12:09:55.665 AdditionNumbers[1698:f803] Could not load the "dropdown2.png" image referenced from a nib in the bundle with identifier "com.yourcompany.AdditionNumbers"
2012-03-03 12:09:55.909 AdditionNumbers[1698:f803] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array'
*** First throw call stack:
(0x14d1052 0x11bcd0a 0x14bddb8 0x2f0f 0x43064e 0x2abc 0x3689d6 0x3698a6 0x378743 0x3791f8 0x36caa9 0x1bc7fa9 0x14a51c5 0x140a022 0x140890a 0x1407db4 0x1407ccb 0x3692a7 0x36aa9b 0x2a2d 0x29a5)
terminate called throwing an exceptionCurrent
我得到的响应如下所示我必须将这些数据显示在pickerview中它是如何实现的？
name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan"
)
2012-03-03 12:01:27.865 UIPickerView[1654:f803] name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan",
"\n Mike Tsalidis"
)
2012-03-03 12:01:27.865 UIPickerView[1654:f803] name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan",
"\n Mike Tsalidis",
"\n Dana Sugarman"
)
2012-03-03 12:01:27.866 UIPickerView[1654:f803] name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan",
"\n Mike Tsalidis",
"\n Dana Sugarman",
"\n Necip Ozyucel"
)
2012-03-03 12:01:27.867 UIPickerView[1654:f803] name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan",
"\n Mike Tsalidis",
"\n Dana Sugarman",
"\n Necip Ozyucel",
"\n Goksel Topbas"
)
2012-03-03 12:01:27.868 UIPickerView[1654:f803] name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan",
"\n Mike Tsalidis",
"\n Dana Sugarman",
"\n Necip Ozyucel",
"\n Goksel Topbas",
"\n Nizar Abdul-Baki"
)
2012-03-03 12:01:27.951 UIPickerView[1654:f803] name is->>>>>>> : (
"\n Enrico Gaetani",
"\n J\U00e9r\U00f4me Tredan",
"\n Mike Tsalidis",
"\n Dana Sugarman",
"\n Necip Ozyucel",
"\n Goksel Topbas",
"\n Nizar Abdul-Baki",
"\n Johannes Kanis"
)
答案 0 :(得分：0)
您是否在.h文件中设置了UIPickerView的代理？
当您致电[materialarray]
viewDidLoad似乎没有数据