IOS Picker Control

A picker is a common control.

You need to reference two protocols before using the picker <UIPickerViewDataSource,UIPickerViewDelegate>

Also need to connect Datesource & Delegate

After calling the protocol, you need to override three methods

-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) Pickerview This method returns the number of pickers.

-(NSString *) Pickerview: (Uipickerview *) Pickerview Titleforrow: (nsinteger) Row forcomponent: (Nsinteger) component This method returns a string of values for any picker

｛

if (component==0)

{

return array_1.count;

}

Else

{

return array_2.count;

}

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-(Nsinteger) Pickerview: (Uipickerview *) Pickerview numberofrowsincomponent: (Nsinteger) Component This method returns the number of any number of strings

｛

　　

if (component==0)

{

return array_1.count;

}

Else

{

return array_2.count;

}

｝

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

{

if (component==0)

{

NSString *select=[self.array_1 Objectatindex:row];

Self.array_2=[self.date Objectforkey:select];

[Self.picker reloadcomponent:1]; Reloadcomponet method can refresh the picker again

}

}

Data from the picker can be removed from the P li s t file.

Select an array

Select an array type.

NSBundle * Bundle=[nsbundle mainbundle];//get a bundle;

NSString * Plistpath=[bundle pathforresource:@ "List" oftype:@ "plist"];//Get Path

Nsdictionary *dic=[[nsdictionary alloc]initwithcontentsoffile:plistpath]; Get to a dictionary by path

Self.date=dic;

Nsarray *array=[self.date AllKeys]; Get all Keys

Nsarray *sorted=[array sortedarrayusingselector: @selector (compare:)];

self.array_1=sorted;

NSString *select_1=[self.array_1 objectatindex:0]; Gets the first segment of the character

Nsarray *col2=[self.date objectforkey:select_1];

Self.array_2=col2;

Put the data in the plist file into a dictionary. The picker is then assigned a value through a dictionary.

IOS Picker Control