Basic use of the Uipickerview simple selector

Create a class that implements the basic functionality of Uipickerview

#import "PickerViewController.h"

Compliance with Uipickerviewdatasource,uipickerviewdelegate Protocol

@interface Pickerviewcontroller () <UIPickerViewDataSource,UIPickerViewDelegate>

Declaring a simple selector

@property (Nonatomic,strong) Uipickerview *picker;

Picker array of data sources for the first column of data

@property (Nonatomic,strong) Nsmutablearray *firstlist;

Picker data source array for the second column of data

@property (Nonatomic,strong) Nsmutablearray *secondlist;

Used to display selected content on a simple selector

@property (Nonatomic,strong) UILabel *showlable;

Picker Select the Click button to update the data on the lable

@property (Nonatomic,strong) UIButton *button;

Picker the data selected in the first column

@property (nonatomic,copy) NSString *firststr;

Picker the data selected in the second column

@property (nonatomic,copy) NSString *secondstr;

@end

@implementation Pickerviewcontroller

Picker lazy loading for picker initialization and setup

-(Uipickerview *) picker{

if (!_picker) {

Self.picker = [[Uipickerview alloc] Initwithframe:cgrectmake (40)];

_picker.shouldgroupaccessibilitychildren = YES;

_picker.delegate = self;

_picker.datasource = self;

}

return _picker;

}

-(UIButton *) button{

if (!_button) {

Self.button = [UIButton buttonwithtype:uibuttontypecustom];

_button.frame = CGRectMake (self.view.bounds.size.width-300, 30);

[_button settitle:@ "confirm" forstate:uicontrolstatenormal];

[_button addtarget:self Action: @selector (handlebuttonaction:) forcontrolevents:uicontroleventtouchupinside];

_button.backgroundcolor = [Uicolor Cyancolor];

}

return _button;

}

-(void) Handlebuttonaction: (UIButton *) sender{

Self.showLable.text = [NSString stringwithformat:@ "%@%@", Self.firststr,self.secondstr];

}

Display selection data for picker

-(UILabel *) showlable{

if (!_showlable) {

self.showlable = [[UILabel alloc] Initwithframe:cgrectmake (40)];

_showlable.backgroundcolor = [Uicolor Yellowcolor];

_showlable.textalignment = Nstextalignmentcenter;

_showlable.text = @ "1 1";

}

return _showlable;

}

Settings for the data source

-(Nsmutablearray *) firstlist{

if (!_firstlist) {

Self.firstlist = [Nsmutablearray arraywithobjects:@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "7", @ "8", @ "9", @ "ten", nil];

}

return _firstlist;

}

-(Nsmutablearray *) secondlist{

if (!_secondlist) {

Self.secondlist = [Nsmutablearray arraywithobjects:@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "7", @ "8", @ "9", @ "ten", nil];

}

return _secondlist;

}

-(void) Viewdidload {

[Super Viewdidload];

Do any additional setup after loading the view.

Adding controls on a view

[Self.view AddSubview:self.picker];

[Self.view AddSubview:self.button];

[Self.view addSubview:self.showLable];

Initialize the data on the lable

SELF.FIRSTSTR = @ "1";

SELF.SECONDSTR = @ "1";

}

#pragma Mark Uipickerviewdelegate

Pickerview Number of columns

-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) pickerview{

return 2;

}

Returns the number of elements in each column

-(Nsinteger) Pickerview: (Uipickerview *) Pickerview numberofrowsincomponent: (Nsinteger) component{

if (component = = 0) {

return self.firstList.count;

}

return self.secondList.count;

}

Returns the width of each column

-(CGFloat) Pickerview: (Uipickerview *) Pickerview widthforcomponent: (Nsinteger) component{

return 50;

}

Returns the elements of each row in each column

-(NSString *) Pickerview: (Uipickerview *) Pickerview Titleforrow: (nsinteger) Row forcomponent: (Nsinteger) component{

if (component = = 0) {

return Self.firstlist[row];

} else {

return Self.secondlist[row];

}

}

Use the string assignment string property of the selected row in the array for lable display

-(void) Pickerview: (Uipickerview *) Pickerview Didselectrow: (nsinteger) Row incomponent: (Nsinteger) component{

if (component = = 0) {

Self.firststr = Self.firstlist[row];

} else {

Self.secondstr = Self.secondlist[row];

}

}

-(void) didreceivememorywarning {

[Super didreceivememorywarning];

Dispose of any resources the can be recreated.

}

/*

#pragma mark-navigation

In a storyboard-based application, you'll often want to do a little preparation before navigation

-(void) Prepareforsegue: (Uistoryboardsegue *) Segue Sender: (ID) Sender {

Get The new view controller using [Segue Destinationviewcontroller].

Pass the selected object to the new view controller.

}

*/

@end

Basic use of the Uipickerview simple selector