uipickerview

I have been beating my head against the wall trying to diagnose my app's inability to automatically preselect the last row of a UIPickerView using code that successfully worked under older versions of XCode. I think this is a bug in Xcode rather than iOS 6 because my old app running on an iOS 6 device works properly, but recompiling the code under Xcode 4.5.2 does not behave properly. I have put together the following sample to demonstrate the problem, but before I submit a bug report, I would like opinions from others on this forum to determine if the problem is with my code or is indeed a

A number of posts are dealing with the subject: How to make an inline UIPickerView . As I am lazy, can anyone point me to a code snippet. To be honest, I find the Apple DateCell sample pedantic - there has to be an a more elegant method. Is the dateCell app a good place to start? or are there other better links. I would appreciate any advice. If you read this and do not understand my requirements / goal, please see the two posts referenced above or simply download the Apple Sample (dev. account required). I use another - maybe simpler - solution to solve this. Image that we have two cells Date

I'm currently developing an app using Swift where I use a UIPickerView, see below for image. Currently the UIPickerView stops when the user has scrolled to the last data, but i want it no never stop. I want it to be possible to start from the first data by just keep on scrolling when you're at the bottom. Or scroll up when at the top. I want it to be like Apple's Countdown where you can drag up or down whenever you want. How I want it to be: How it currently is: There will be four steps here -- we'll set up some constants to hold the picker view data and a bit of configuration, then we'll add

Is there a way to make the UIPickerView only Read Only? This means that the user cannot flip through the options. PS. This is not the same as not passing anything in the didSelectRow method because I only want the user to see that the picker is there and not to touch it. Set the picker's userInteractionEnabled to NO. Use this to make it not interactable [pickerObj setUserInteractionEnabled:NO]; and this to [pickerObj setAlpha:.6]; fade the opacity so it looks non-interactable If you are using a UIPickerView associated with a UITextField , just set the text field's isEnabled property to false .

By default the first row is highlighted after initializing the UIPickerView. How do i highlight a particular row or scroll to particular row programmatically? As always, this is thoroughly documented. The Apple documentation for UIPickerView should tell you that the method you probably want is – selectRow:inComponent:animated: . If you want to trigger delegate's method pickerView:didSelectRow:inComponent, you should call it manually: Obj-C [self.myPickerView selectRow:0 inComponent:0 animated:NO]; [self pickerView:self.myPickerView didSelectRow:4 inComponent:0]; Swift self.myPickerView

What i have so far is @synthesize txtCountry,txtState; int flgTextField; - (BOOL)textFieldShouldBeginEditing:(UITextField *)textField { [pickerView reloadAllComponents]; // Make a new view, or do what you want here if(textField == txtCountry || textField == txtState){ flgTextField = textField.tag; [UIView beginAnimations:nil context:NULL]; //[pvState setFrame:CGRectMake(0.0f, 199.0f, 320.0f, 216.0f)]; [UIView commitAnimations]; return NO; } else { return YES; } } - (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView; { return 1; } - (NSInteger)pickerView:(UIPickerView *

UIPickerView UIPickerView控件也是iPhone中比较常用到的一个控件,它通过转界面提供一系列多值选项,它向用户显示信息,也收集用户输入。 UIPickerView里⾯的组件数和组件里的 要使用UIPickerView就要遵守两种协议, 一个是UIPickerViewDelegate,另⼀种是UIPickerViewDataSource。 添加UIPickerView必须实现的代理⽅法: 1、列数:numberOfComponentsInPickerView; 2、行数:numberOfRowsInComponent; 添加一个pickerView的步骤： 1.实例化一个pickerView对象 UIPickerView *picker=[[UIPickerView alloc]initWithFrame:[[UIScreen mainScreen]bounds]]; 2，遵守两个协议，并设置代理 在.h文件里遵守协议<UIPickerViewDelegate,UIPickerViewDataSource> picker.dataSource=self; picker.delegate=self; 3.将控件添加在页面上 [self.view addSubview:picker]; 实现两个必要方法。设置行数和组数 -(NSInteger)pickerView

一.UIPickerView 1.UIPickerView的常见属性 // 数据源(用来告诉UIPickerView有多少列多少行) @property(nonatomic,assign) id<UIPickerViewDataSource> dataSource; // 代理(用来告诉UIPickerView每1列的每1行显示什么内容,监听UIPickerView的选择) @property(nonatomic,assign) id<UIPickerViewDelegate> delegate; // 是否要显示选中的指示器 @property(nonatomic) BOOL showsSelectionIndicator; // 一共有多少列 @property(nonatomic,readonly) NSInteger numberOfComponents; 2.UIPickerView的常见方法 // 重新刷新所有列 - (void)reloadAllComponents; // 重新刷新第component列 - (void)reloadComponent:(NSInteger)component; // 主动选中第component列的第row行 - (void)selectRow:(NSInteger)row inComponent:(NSInteger

// // ViewController.h // 手写 UIDatePicker // // Created by 非凡 程序员 on 15/11/13. // Copyright (c) 2015 年 非凡 程序员 . All rights reserved. // #import <UIKit/UIKit.h> @interface ViewController : UIViewController @property ( nonatomic , strong ) UIDatePicker *datePicker; @end // // ViewController.m // 手写 UIDatePicker // // Created by 非凡 程序员 on 15/11/13. // Copyright (c) 2015 年 非凡 程序员 . All rights reserved. // #import "ViewController.h" @interface ViewController () @end @implementation ViewController - ( void )viewDidLoad { [ super viewDidLoad ]; // 定义一个 datePicker _datePicker = [ [ UIDatePicker alloc