uipickerview

问题 I am new to ios development. I am making a custom datepicker using uipickerview. I have datesArray to be used as a data source for uipickerview. I want to know how to show only Labels : today,tomorrow,Fri,Sat,Sun,Mon,Tues for current week and rest dates in format "EEE, LLL d". I tried this code but it didn't work. for(int i=0;i<22;i++) { NSDate *myDate = [NSDate dateWithTimeIntervalSinceNow:60 * 60 * 24 * i]; NSDate *now=[NSDate date]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]

问题 I'm trying to reload UIPickerView , because, when I chose select for exemple the secon item of a PickerView, at the second PickerView choosing the placement of the selector don't get back to the first, and the data isn't reloaded perfectly, so I try this: NSNotificationCenter.defaultCenter().addObserver(self, selector: ("updatePicker"), name: UITextFieldTextDidBeginEditingNotification, object: nil) func updatePicker(){ self.pickerView.reloadAllComponents() } But I get an error: fatal error:

问题 1.--> I need to customize a UIPickerview elements to start from the top.As of now we can see the picker elements starting from the middle like the one shown in figure(apple started from middle of picker) but not from the top... Is there a way to do it?How can I do it ? 2.--> How can I make a PickerView Start At A Certain Row When It Is First Displayed I knew this code: [self.view addSubview:aPicker]; [aPicker selectRow:14 inComponent:0 animated:NO]; But I have a textfield and I want the

问题 This question already has an answer here : How to distinguish between multiple uipickerviews on one page (1 answer) Closed 2 years ago . My code below uses a UIPickerView and works perfectly. However I do not know how to repeat this process for 2 different picker views that each contain separate information. l2 and pl2 are the 2nd picker view and label. import UIKit class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate{ @IBOutlet var l: UILabel! @IBOutlet var pl

问题 I'm looking to populate an array to be used in a pickerview. The data for the array is generated from a database table. I have the following JSON_ENCODED array (created in php): {"result": [ {"id":"3","quivername":"Kite Boarding"}, {"id":"4","quivername":"Live and Die in LA"}, {"id":"14","quivername":"Bahamas Planning"}, {"id":"15","quivername":"My Trip to India"}, {"id":"16","quivername":"Snowboarding"} ] } UPDATE FOR WEBSERVICE PHP CODE I run this function as a webservice: passport($

问题 I have these JSON output using PHP. [ {"number":"001","name":"MIKE"}, {"number":"002","name":"JOSH"} ] In Swift, I managed to select "name" value and display it into UIPickerView like below. DropdownJSON.swift import UIKit class DropdownJSON: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate { @IBOutlet var dropdownTxt: UITextField! @IBOutlet var dropdownPV: UIPickerView! @IBOutlet var numberLbl: UILabel! @IBOutlet var nameLbl: UILabel! var persons = [Person]

问题 I want to change font size of date picker and picker view. is this possible ? if is it? then how it done. 回答1: There is no any API for change apperiance of UIDatePicker . You can make a pretty convincing replica yourself using a UIPickerView - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView { return a;} - (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component { return b;} - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:

问题 In my app I have a button that when pressed should present a UIPickerView with a UIToolbar on top of it. When the user has selected the value in the UIPickerView they then press a button in the UIToolbar which dismisses both the UIPickerView and UIToolbar . The problem I'm having is that I can't figure out a way to add the UIToolbar to the UIPickerView . Normally I would have a setup where a value in a UITextField is impacted by the selection in the UIPickerView . This way I can simply set

问题 I have a tableview whose data are selected from a pickerView(3 columns).Here is the code: - (void)viewDidLoad { [super viewDidLoad]; //PickerView content and sort them for displaying Number=@[@"Trans",@"2005",@"2006",@"2007",@"2008",@"2009",@"2010",@"2011",@"2012",@"2013",@"2014",@"2015",@"2016"]; Season=@[@"Spring",@"Summer",@"Fall"]; Course=@[@"CHEM1100 General Chem I",@"CHEM2100 General Chem II",@"CHEM3511 Org Chem",@"CHEM3521 Org Chem II"]; Course =[Course sortedArrayUsingSelector:

问题 URL I am adding text inside the uitextview using uipickerview. Currently i am adding the text as below ( did select row method ) self.myTextView.text = [NSString stringWithFormat:@"%@ %@", self.myTextView.text, [myTierThreeData objectAtIndex:row]]; This works fine but i wanted to insert text where the cursor is so i did the below -(void) pickerViewShown:(id)sender{ myCursorPosition = [self.myTextView selectedRange]; } When ever the pickerview is shown, taken the cursor position in the member