iOS development--uipickerview (selector control) practices for provinces and cities

Uipickerview is a selector control that can generate a single-column selector, or a multicolumn selector

@interface viewcontroller:uiviewcontroller<uipickerviewdatasource,uipickerviewdelegate>

@property (strong,nonatomic) Uipickerview *mypickerview;

@property (strong,nonatomic) Nsmutablearray *provincearr;

@property (strong,nonatomic) Nsmutablearray *cityarr;

@property (strong,nonatomic) Nsarray *arr;

@end

#import "ViewController.h"

@interface Viewcontroller ()

@end

@implementation Viewcontroller

-(void) viewdidload

{

[Super Viewdidload];

Self. Provincearr=[nsmutablearray array];

Self. Cityarr=[nsmutablearray array];

Path to the file

NSString *path=[[nsbundle Mainbundle] pathforresource:@ "City" oftype:@ "plist"];

Self.arr=[nsarray Arraywithcontentsoffile:path];

The traversal cycle of the province

for (int i=0;i<self.arr.count; i++)

{

[Self. Provincearr addobject:self.arr[i][@ "state"];

}

Picker control

Self. Mypickerview=[[uipickerview Alloc] Initwithframe:cgrectmake (70, 100, 300, 300)];

Self. mypickerview.delegate=self;

Self. mypickerview.datasource=self;

Self. Mypickerview.backgroundcolor=[uicolor Clearcolor];

[Self.view addsubview:self. Mypickerview];

}

#pragma mark data source Numberofcomponentsinpickerview

-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) Pickerview

{

return 2;

}

#pragma mark data source Numberofrowsincomponent

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

{

if (component==0)

{

return self. Provincearr.count;

}

Else

{

return self. Cityarr.count;

}

}

#pragma delegate Display information methods

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

{

if (component==0)

{

return self. Provincearr[row];

}

return self. Cityarr[row];

}

#pragma mark Select BOC Information

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

{

if (component==0)

{

[Self. Cityarr Removeallobjects];

Nsinteger Rowprovincearr=[pickerview selectedrowincomponent:0];

Nsarray *arr11=self.arr[rowprovincearr][@ "Cities"];

The traversal cycle in the city

for (int i=0; i<arr11.count; i++)

{

[Self. Cityarr addobject:arr11[i][@ "City"];

}

Refresh Reload

[Self. Mypickerview Reloadcomponent:1];

}

Else

{

Uialertview *myalertview=[[uialertview alloc] initwithtitle:@ "System tip" message:[nsstring stringwithformat:@ "%@--%@ ", [_provincearr objectatindex:row],[_cityarr objectatindex:row]]delegate:nil cancelbuttontitle:@" Cancel " otherbuttontitles:@ "OK", nil];

[Myalertview show];

NSString *str=[nsstring stringwithformat:@ "%@--%@", _provincearr[[pickerview selectedrowincomponent:0]],_cityarr[ Row]];

Prompt box

Uialertcontroller *myalertcontroller=[uialertcontroller alertcontrollerwithtitle:@ "System Tips" message:str Preferredstyle:uialertcontrollerstylealert];

Uialertaction *myalertaction=[uialertaction actionwithtitle:@ "OK" Style:uialertactionstyledefault handler:^ ( Uialertaction * _nonnull Action)

{

NSLog (@ "OK");

}];

Uialertaction *myalertaction1=[uialertaction actionwithtitle:@ "Cancel" Style:uialertactionstyledefault handler:^ ( Uialertaction * _nonnull Action)

{

NSLog (@ "Cancel");

}];

[Myalertcontroller addtextfieldwithconfigurationhandler:^ (Uitextfield * _nonnull TextField)

{

Textfield.backgroundcolor=[uicolor Whitecolor];

}];

[Myalertcontroller Addaction:myalertaction1];

[Myalertcontroller addaction:myalertaction];

[Self Presentviewcontroller:myalertcontroller animated:yes completion:nil];

}

}

#pragma mark shows the row height

-(CGFloat) Pickerview: (Uipickerview *) Pickerview rowheightforcomponent: (Nsinteger) component

{

return 50.00;

}

iOS development--uipickerview (selector control) practices for provinces and cities