uipickerview

问题 I have been working on the app, that has 3 uipickers. I want to implement images in each uipicker. However as seen in the image attached below, it just affects only one uipicker, not all of them.I would like to know how I could able to custom all uipicker elements shown in the image - (void)loadView { picker1 = [[UIPickerView alloc] initWithFrame:CGRectMake(30, 200, 250, 250)]; picker1.delegate = self; picker1.dataSource = self; picker1.showsSelectionIndicator = YES; picker1.tag=1; picker2 =

问题 I am working with a UIPickerView and trying to implement the functionality of loading second component with the data that is mapped to value selected in the first component. But, my second component always shows the values that are mapped to second row of my first component. With breakpoints I noticed the values are correctly passed on for - (UIView *)pickerView:(UIPickerView *)iPickerView viewForRow:(NSInteger)iRow forComponent:(NSInteger)iComponent reusingView:(UIView *)iView method. Please

问题 Is it possible to add a search bar to look up values in the UIPickerView generated by a <select> menu tag? I have a UIWebView app that has <select> menus with 100+ <option> tags and the iPhone opens a UIPickerView, but it's kind of hard to choose an option, I thought a search bar would be the easiest way! My original question with database details: iPhone scroll-wheel picker for <select> menus EDIT: or is it possible to make the iPhone open <select> menus in a UITableView rather than

问题 I think my problem spans over multiple VC. In the table VC I perform a fetch request that returns an array of Floor objects. This entity has 2 attributes (floor number and number of rooms in floors). If I assign 2 floors (0 and 1) it works and prints them. The next VC contains a picker that displays the number of floors and a text box that is used to assign the number of rooms per floor. There must be a problem with this function because it gets called only if the first item of the picker is

问题 I have a custom UIPickerView with three components that are dependent on one another (i.e., the second one shows values depending on what has been selected in the first one and the third is dependent on the first and second). I am getting the values that are shown in the UIPickerView out of an NSDictionary . Everything works nicely, except, when I spin two of the components at the same time, the app sometimes crashes (no time to reload data). This is what my pickerView:didSelectRow

问题 I have a multiple file to attach inside the picker view. When user select that picker view item, they can click email button to attach the chosen file. How do I do so in my picker view? Here is my sample code. M File : -(void)pickerViewEmail:(UIPickerView *)pickerViewEmail didSelectRow:(NSInteger)row inComponent:(NSInteger)component { if ([[musicList objectAtIndex:row] isEqual:@"m1"]) { MFMailComposeViewController *pickerEmail = [[MFMailComposeViewController alloc] init]; pickerEmail

问题 This is by no means a needed thing. It would be nice if possible. I am not sure if this can be done. I have a UIPickerView and it will have 41-42 options. Right now I have all of my options alphabetically. I want them to be broken into groups and before each group I want it to have a title. Similar to how a TableView has sections and you can give each section a title. I want the title of each section in the picker but I don't want it to be a selectable row. For example: Picker options: Core

问题 I have a situation where my UIPickerView is getting "starved" by a computation task; in other words, the UIPickerView is never updated -- and hence, never sends messages -- because a very heavy compute task is happening. The picker controls aspects of the computation, so the two have to play nice. I thought of running the computation in a separate thread. Seems like that would leave the picker free to update. However, it'd be a massive undertaking to make my computation multithread-able, so I

问题 I have two UiTextfield which are supposed to show different UiPickerView when clicked on a respective UiTextfield....... so i used this if(textField.isFirstResponder() == true) to find which textfield has been clicked...this does not work class ViewController: UIViewController, UIPickerViewDataSource , UIPickerViewDelegate { var pickerData = ["11", "12", "13"] var pickerDataOthr = ["ada","daad","ada","daad","ada","daad","ada","daad"] @IBOutlet weak var textField: UITextField! @IBOutlet weak

问题 I'm trying get a value out of the selected row in UIPickerView and, depending on the selected row, set a time interval for repeating notifications. i.e., users choose "Every 2 minutes" in UIPickerView and get a notification every 120.0 seconds. The second "didSelectRow" method does not seem to store the value in my variable interval , I didn't find a solution for that so far. This is my code so far: import UIKit import UserNotifications import UserNotificationsUI class ViewController: