uipickerview

问题 I have to change the color of the selected row in a UIPickerView . I did managed to change the color, i know that the question already have several replies, anyway those do not satisfy me: with those implementation, the animation of the pickerview is glitchy and i don't like it. This is the code of the current solution func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView { var label: UILabel if view == nil { label =

问题 I have a simple UI picker view in an iOS app (iPhone) and I'm looking to pre-populate it with a range of numbers on launch. What would be the most pragmatic/quickest/optimized way to populate it? I'm new to iOS development, so I'm just starting to test the waters. The documentation is pretty decent but I'd like to get some insight from seasoned developers on the most effective way to accomplish what I'm doing? tl;dr I want to populate a UI picker view with the the number range 45-550 upon the

问题 How to Customise the height of UIPickerView more then 250 . i have done the following but unable to get the height as given -(void)pickerview:(id)sender { pickerView=[[UIPickerView alloc] initWithFrame:CGRectMake(0,200,320,400)]; pickerView.transform = CGAffineTransformMakeScale(0.75f, 0.75f); pickerView.delegate = self; pickerView.dataSource = self; pickerView.showsSelectionIndicator = YES; pickerView.backgroundColor = [UIColor lightGrayColor]; [pickerView selectRow:1 inComponent:0 animated

问题 I don't have any idea how can I create a custom UIPickerView with an image on the side of the text. I've been searching for a method and I just found this: - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view But I don't know how I can use that. These are my arrays: All works perfectly, I just want to put a diferent image in each row, with 10 different colors. The colors will be the same for the 3 components

问题 I build my project in Xcode 8. UIPickerView separator lines are not visible in iOS 10 simulator and the devices, but works fine on iOS 9.3 devices and simulator. I tried to adjust the UIPickerView back ground color, auto layouts and everything possible in the XIB, but nothing works. Anyone have an idea on this? This is a custom view which contains a UIPickerView -(void)layoutSubviews{ isShown = NO; [super layoutSubviews]; //self.selectedDic = nil; self.doneBtn.tintColor = COLOR_DB3535; self

问题 i used this code to show uipicker in uiactionsheet but when i click close button i want to remove action sheet from view. so what should be the code for removing actionSheet form view. - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:nil cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil]; [actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent]; CGRect pickerFrame =

问题 I keep getting a exc bad access error and I think it has something to do with my UIPickerView because this is when the app crashes. Everything works fine until I make a 9th choice from the UIPickerView. Every single time the app crashes on the 9th choice. Any ideas? - (void)viewDidLoad { [super viewDidLoad]; list = [[NSMutableArray alloc] init]; [list addObject:@"Anvil"]; [list addObject:@"Apple"]; [list addObject:@"Arrow"]; [list addObject:@"Baby"]; [list addObject:@"Basketball"]; [list

问题 The UIPickerView that appears in Safari has a check mark beside the current choice. Is there a built-in way to get this, or do I have to program it up myself? If I do have to create it, can anyone point me to some code to do this? Thanks 回答1: You need to implement -pickerView:viewForRow:forComponent:reusingView: from the UIPickerViewDelegate. You have to create a view, that contains a UIButton with the checkmark image, and return it from -pickerView:viewForRow:forComponent:reusingView: 回答2:

问题 I want to animate my UIPickerView after pressing the button. I already have coded my UIPickerView to be hidden on viewDidLoad and not hidden after pressing a button, but it doesn't animate like how a ModalViewController animates by default. I just want my UIPickerView to be animated just like a ModalViewController animates by default. I've researched already on the site, and on the web, but I can't seem to do it properly. Here's my code: #pragma mark - Picker View - (NSInteger

问题 So I have a uipickerview with rows that only contain the number 0-24 and it looks a bit silly since the numbers are left aligned leaving a huge gap on the right of the pickerview. Is there an easy way to center align text in a uipickerview? 回答1: - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)]; label.text = [NSString