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POUIPickerView added to uitableviewcontroller.view won't rotate
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  1. POUIPickerView added to uitableviewcontroller.view won't rotate
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    copied!<p>I have a UIPickerView as subview in a UITableViewController, which I want to slide up in place when a certain row is clicked. I have implemented the necessary dataSource and delegate methods, but the pickerview acts weirdly. It acts as if it were mechanically jammed, it cannot rotate properly, it just moves a little. If I try to spin it a few times I get this message in the debugger console:</p> <blockquote> <p>SendDelegateMessage: delegate failed to return after waiting 10 seconds. main run loop mode: UITrackingRunLoopMode If you were not using the touch screen for this entire interval (which can prolong this wait), please file a bug.</p> </blockquote> <p>I googled for this, to no avail. Anyway, here is the relevant code. As you may guess, this is a number picker (to choose a percentage value).</p> <pre><code>- (void)viewDidLoad { [super viewDidLoad]; percentPicker = [[UIPickerViewalloc] initWithFrame:CGRectMake(0,420, 320, 200)]; percentPicker.delegate = self; percentPicker.dataSource = self; percentPicker.showsSelectionIndicator = YES; [self.view addSubview:percentPicker]; } - (void)viewWillAppear:(BOOL)animated { // sets the rows to the appropriate value // etc } - (void)startEditingPercentage { [UIView beginAnimations :nilcontext:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIViewsetAnimationDuration:kPickerAnimationDuration ]; percentPicker.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, 0, -220.0); [UIViewcommitAnimations]; } - (void)stopEditingPercentage { NSLog(@"stopEditingPercentage"); [UIView beginAnimations :nilcontext:NULL]; [UIViewsetAnimationBeginsFromCurrentState:YES]; [UIViewsetAnimationDuration:kPickerAnimationDuration]; percentPicker.transform = CGAffineTransformIdentity; [UIView commitAnimations]; } #pragma mark UIPickerView delegate and dataSource methods - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return4; } - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { return10; } - (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component { return44; } - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { UILabel *retval = (UILabel *)view; if (!retval) { retval= [[UILabel newLabelWithPrimaryColor :[UIColorblackColor ] selectedColor:[ UIColor blackColor] fontSize:22bold:YEStransparent:YES] autorelease]; } retval.frame = CGRectMake(0, 0, 44, 44); retval.textAlignment = UITextAlignmentCenter; retval.backgroundColor = [UIColor clearColor]; retval.text = [NSStringstringWithFormat:@"%i", row]; if (component &gt; 1 ) { // rows 2 and 3 are decimal, white on black retval.backgroundColor = [UIColor blackColor]; retval.textColor = [UIColor whiteColor]; } return retval; } - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component { NSString *selectedValue; selectedValue= [NSString stringWithFormat:@"%i%i.%i%i" ,[percentPickerselectedRowInComponent :0], [ percentPickerselectedRowInComponent: 1], [percentPickerselectedRowInComponent:2], [percentPickerselectedRowInComponent:3]]; NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init]; NSString *trimmedValue = [[formatter numberFromString:selectedValue] stringValue]; percentValue.text = trimmedValue; [formatter release]; } </code></pre> <p>As you see, I use the transform property to move the picker in and out (down) my main view; the startEditing and stopEditing methods are triggered by selection in the teble view. Yet, for the debugging purposes, I eliminated these transitions , and left the picker on top of the table, but nothing changed. I also commented the didSelect method, but this also didn't change anything. By the way, the same picker-view construction code vorkw allright in another view of the same app. Any suggestion? Cheers,</p>
 

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