uipickerview

JSON Arrays and Sorting

由 老子叫甜甜 提交于 2019-12-07 21:55:07
问题 I have this json array which I have outlined below. I want to know how I could get all the strings under the "name" key only and place in a certain array to be sorted alphabetically by name and later split into further arrays in accordance to the first letter in the names. Any guide to carrying this out will be much appreciated, thanks. I am using the json kit via github and also NSJSONserialization. { "proj_name": "Ant", "id": [ { "name": "David" }, { "name": "Aaron" } ] }, { "proj_name":

How to call pickerView: didSelectRow: inComponent: without user interaction?

由 爷，独闯天下 提交于 2019-12-07 18:08:42
问题 I have a 2 components, dependent pickerView . I have a preview UIImageView that changes each time the user uses the pickerView (and triggers the didSelectRow:inComponent: ). This works just as I expected. However, I want the pickerView to trigger didSelectRow: when the app launches, so that there is a Preview the moment the user sees the UIImageView . In viewDidLoad , when I try this: [self pickerView:picker didSelectRow:row inComponent:component]; // row and component have 0 values. next

How to dynamically pop up and hide UIPickerView in iOS (Xamarin C#) game?

由 本小妞迷上赌 提交于 2019-12-07 16:12:17
问题 I have seen a very good example of implementing UIPickerView at: Picker in Xamarin.iOS available However, my scenario is a little more complex than that because I don't want to constantly display the picker on the screen. Instead, I want to dynamically display and hide the picker in my game as needed. Specifically, here is what I want to implement: (A) First, on my game screen, when users click on a button called " Choose Background Color ", I will need to pop up a picker that shows 3 values:

UIPickerView selectrow crash in iOS 6

由 孤者浪人 提交于 2019-12-07 12:53:37
问题 My application build & run in iOS 5.x perfectly, but it crashes when I call selectRow:inComponent:animated: method of UIPickerView in iOS 6. code : [_pickerview selectRow:1 inComponent:0 animated:NO]; I know this method is not work in iOS6 when I googled it, but I want to know other method to do this effect? 回答1: Your crash log says you have used a -1 in code where should be a number in range {0, 1}. But in the the code you paste you indeed use 1 . So you need to check your parameter for your

UIPickerView crashes app when user is spinning components at the same time

由 旧街凉风 提交于 2019-12-07 10:46:27
问题 I've got really unbearable issue with UIPickerView. There're 2 components: first one with food categories, and second with foods inside each category. I've got proper arrays with foods, which looks like: ViewController.h @property (strong, nonatomic) NSArray *leftPickerDataSource; @property (strong, nonatomic) NSArray *vegetablesDataSource; @property (strong, nonatomic) NSArray *eggsDataSource; @property (strong, nonatomic) NSArray *pastaDataSource; @property (strong, nonatomic) NSArray

Multi-Component Picker (UIPickerView) in SwiftUI

由 扶醉桌前 提交于 2019-12-07 10:24:57
问题 I'm trying to add a three-component Picker (UIPickerView) to a SwiftUI app (in a traditional UIKit app, the data source would return 3 from the numberOfComponents method), but I can't find an example of this anywhere. I've tried adding an HStack of three single-component Pickers, but the perspective is off from what it would be if they were all part of a single Picker. 回答1: Updated answer in pure SwiftUI - in this example the data is of type String . Tested on Xcode 11.1 - may not work on

How insert an images and text in specific rows of an UIpickerView?

由 早过忘川 提交于 2019-12-07 07:43:28
I have implemented the following function: - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view { UIImage *img = [UIImage imageNamed:@"persona.jpeg"]; UIImageView *temp = [[UIImageView alloc] initWithImage:img]; temp.frame = CGRectMake(-70, 10, 60, 40); UILabel *channelLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, -5, 80, 60)]; channelLabel.text = @"persona y"; channelLabel.textAlignment = UITextAlignmentLeft; channelLabel.backgroundColor = [UIColor clearColor]; UIView *tmpView = [[UIView alloc]

UIPickerView column Titles

由 廉价感情. 提交于 2019-12-07 06:40:26
问题 I am looking for a way to add a title to each column (component) of the UIPickerView. In all the examples I've seen there are no titles because in general the columns meaning could be figured out based on its order, content and context... however in my application it would be dangerous to confuse the columns so I need to give them titles. Regards, Craig 回答1: The way I'd do this would be to create a parent UIView that holds your UIPickerView & add a series of UILabels for column titles. So you

How to give this picker view a datasource

由 落爺英雄遲暮 提交于 2019-12-07 05:08:20
问题 Here I am adding a pickerview programaticly - (void)viewDidLoad { [super viewDidLoad]; CGRect pickerFrame = CGRectMake(0,280,321,200); UIPickerView *myPickerView = [[UIPickerView alloc] init]; //Not sure if this is the proper allocation/initialization procedure //Set up the picker view as you need it //Set up the display frame myPickerView.frame = pickerFrame; //I recommend using IB just to get the proper width/height dimensions //Add the picker to the view [self.view addSubview:myPickerView]

iOS6 UIPickerView memory leak issue.

由 六眼飞鱼酱① 提交于 2019-12-07 03:58:46
问题 I was getting this memory leak: [UIPickerTableViewTitleCell initWithStyle:resuableIdentifier]; and NSConcentrateMutableAttributedString. Issue was that I had not implemented this delegate. After implementing this now memory leaks goes away. May be this information helpful for other as I spend mine 16 hours only to figure out this issue. // Do something with the selected row. - (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component
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