UIPickerView simple application: uipickerview Application

UIPickerView simple application: uipickerview Application

Below are some

 

 

 

 

 

The following is the code. It is boring, but it is not difficult.

 

 

#import <UIKit/UIKit.h>@interface ViewController : UIViewController<UIPickerViewDelegate,UIPickerViewDataSource>@property(strong,nonatomic) UIPickerView *picker;@property(strong,nonatomic) NSMutableArray *sheng;@property(strong,nonatomic) NSMutableArray *shi;@property(strong,nonatomic) NSArray *array;@end

 

 

# Import "ViewController. h "@ interface ViewController () @ end @ implementation ViewController-(void) viewDidLoad {[super viewDidLoad]; self. sheng = [NSMutableArray array]; self. shi = [NSMutableArray array]; NSBundle * bundle = [NSBundle mainBundle]; NSString * path = [bundle pathForResource: @ "city. plist "ofType: nil]; self. array = [NSArray arrayWithContentsOfFile: path]; for (NSDictionary * ar1 in self. array) {NSArr Ay * ar2 = [ar1 objectForKey: @ "Cities"]; [self. sheng addObject: [ar1 objectForKey: @ "State"]; for (NSDictionary * ar3 in ar2) {// NSLog (@ "% @", [ar3 objectForKey: @ "city"]); [self. shi addObject: [ar3 objectForKey: @ "city"] ;}} self. picker = [[UIPickerView alloc] initWithFrame: CGRectMake (0,200,414,300)]; self. picker. backgroundColor = [UIColor greenColor]; [self. view addSubview: self. picker]; self. picker. dele Gate = self; self. picker. dataSource = self ;}# pragma mark-Data Source preview:-(NSInteger) numberOfComponentsInPickerView :( UIPickerView *) pickerView {return 2;} # pragma mark-Data Source pickerView: attributedTitleForRow: forComponent: -(NSInteger) pickerView :( UIPickerView *) pickerView numberOfRowsInComponent :( NSInteger) component {if (component = 0) {return self. sheng. count;} return self. shi. cou Nt ;}# pragma mark-display information method delegate-(NSString *) pickerView :( UIPickerView *) pickerView titleForRow :( NSInteger) row forComponent :( NSInteger) component {if (component = 0) {return self. sheng [row];} return self. shi [row] ;}# pragma mark-information of the selected row-(void) pickerView :( UIPickerView *) pickerView didSelectRow :( NSInteger) row inComponent :( NSInteger) component {if (component = 0) {// clear the selected City [self. shi removeAllObjects ]; NSDictionary * dic = [self. array objectAtIndex: row]; // NSLog (@ "% @", dic); NSArray * arr1 = dic [@ "Cities"]; NSMutableArray * arr2 = [NSMutableArray array]; for (NSDictionary * dic in arr1) {[arr2 addObject: dic [@ "city"];} self. shi = arr2; [self. picker selectRow: row inComponent: 0 animated: YES]; [self. picker reloadComponent: 1];} else {NSInteger firstRow = [self. picker selectedRowInComponent: 0]; NSInteger SecondRow = [self. picker selectedRowInComponent: 1]; NSString * firstString = [self. sheng objectAtIndex: firstRow]; NSString * secondString = [self. shi objectAtIndex: secondRow]; NSString * message = [NSString stringWithFormat: @ "are you sure you want to select %? ", FirstString, secondString]; UIAlertController * alertMessage = [UIAlertController failed: @" prompt "message: message preferredStyle: Success]; UIAlertAction * cancle = [UIAlertAction actionWithTitle: @ "cancel" style: incluhandler: nil]; UIAlertAction * OK = [UIAlertAction actionWithTitle: @ "OK" style: UIAlertActionStyleDefault handler: nil]; [alertMessage addAction: cancle]; [alertMessage addAction: OK]; [self presentViewController: alertMessage animated: YES completion: nil]; NSLog (@ "% @", firstString, secondString );}} # pragma mark-Row Height-(CGFloat) pickerView :( UIPickerView *) pickerView rowHeightForComponent :( NSInteger) component {if (component = 0) {return 80;} return 50 ;} -(void) didReceiveMemoryWarning {[super didreceivemorywarning]; // Dispose of any resources that can be recreated .} @ end