Basis
1.UIPickerView Properties
Data source (used to tell Uipickerview how many rows are in columns)
Copy Code code as follows:
@property (nonatomic,assign) ID dataSource;
Agent (used to tell Uipickerview what to display every 1 lines per 1 column, monitor Uipickerview selection)
Copy Code code as follows:
@property (nonatomic,assign) ID delegate;
Whether to display the selected indicator
Copy Code code as follows:
@property (nonatomic) BOOL showsselectionindicator;
How many columns are there?
Copy Code code as follows:
@property (nonatomic,readonly) Nsinteger numberofcomponents;
2.UIPickerView method
Re-refresh all columns
Copy Code code as follows:
-(void) reloadallcomponents;
Re-refresh the component column
Copy Code code as follows:
-(void) Reloadcomponent: (Nsinteger) component;
Actively select the row of the first component column
Copy Code code as follows:
-(void) SelectRow: (Nsinteger) Row incomponent: (Nsinteger) component animated: (BOOL) animated;
Get the currently selected line number for the component column
Copy Code code as follows:
-(Nsinteger) Selectedrowincomponent: (Nsinteger) component;
3.UIPickerView Data Source Method
How many columns are there?
Copy Code code as follows:
-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) Pickerview;
How many rows are there in the component column?
Copy Code code as follows:
-(Nsinteger) Pickerview: (Uipickerview *) Pickerview numberofrowsincomponent: (nsinteger) component;
4.UIPickerView Proxy method
What is the width of the component column?
Copy Code code as follows:
-(CGFloat) Pickerview: (Uipickerview *) Pickerview widthforcomponent: (nsinteger) component;
What is the row height of the component column?
Copy Code code as follows:
-(CGFloat) Pickerview: (Uipickerview *) Pickerview rowheightforcomponent: (nsinteger) component;
What text is displayed on row component column
Copy Code code as follows:
-(NSString *) Pickerview: (Uipickerview *) Pickerview Titleforrow: (nsinteger) Row forcomponent: (Nsinteger) component;
What view (content) is displayed in row rows of column component
Copy Code code as follows:
-(UIView *) Pickerview: (Uipickerview *) Pickerview Viewforrow: (nsinteger) Row forcomponent: (Nsinteger) component Reusingview: (UIView *) view;
Row component column of Pickerview is selected
Copy Code code as follows:
-(void) Pickerview: (Uipickerview *) Pickerview Didselectrow: (nsinteger) Row incomponent: (Nsinteger) component;
Instance
Uipickerview as a common control of iOS I believe we all have this demand.
Today we will simply create a:
New project Name: Testuipickerview
Create a uipickerview in the default generated Viewcontroller
First, create in the Viewdidload method
Copy Code code as follows:
-(void) Viewdidload {
[Super Viewdidload];
Do no additional setup after loading the view, typically from a nib.
Selection box
Uipickerview *pickerview = [[Uipickerview alloc] initwithframe:cgrectmake (0, 100, 320, 216)];
Show check box
Pickerview.showsselectionindicator=yes;
Pickerview.datasource = self;
Pickerview.delegate = self;
[Self.view Addsubview:pickerview];
_protimelist = [[Nsarray alloc]initwithobjects:@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "7", @ "8", @ "9", @ "ten", nil];
_protitlelist = [[Nsarray alloc]initwithobjects:@ "1", @ "2", @ "3", @ "4", @ "5", @ "6", @ "7", @ "8", @ "9", @ "ten", nil];
}
Then, we create the associated proxy method
Uipickerviewdatasource related Agent
Copy Code code as follows:
#pragma Mark--Uipickerviewdatasource
Number of Pickerview columns
-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) Pickerview {
return 2;
}
Number of Pickerview per column
-(Nsinteger) Pickerview: (Uipickerview *) Pickerview numberofrowsincomponent: (Nsinteger) Component {
if (component = = 0) {
return [_protitlelist Count];
}
return [_protimelist Count];
}
Uipickerviewdelegate Related Proxy method
Copy Code code as follows:
#pragma Mark--uipickerviewdelegate
Width per column
-(CGFloat) Pickerview: (Uipickerview *) Pickerview widthforcomponent: (Nsinteger) Component {
if (component = = 1) {
return 40;
}
return 180;
}
Returns the selected row
-(void) Pickerview: (Uipickerview *) Pickerview Didselectrow: (nsinteger) Row incomponent: (Nsinteger) component
{
if (component = = 0) {
NSString *_pronamestr = [_protitlelist objectatindex:row];
NSLog (@ "namestr=%@", _pronamestr);
} else {
NSString *_protimestr = [_protimelist objectatindex:row];
NSLog (@ "_protimestr=%@", _protimestr);
}
}
Returns the contents of the current row, where the values in the array are added to the scrolling display bar
-(nsstring*) Pickerview: (Uipickerview *) Pickerview Titleforrow: (nsinteger) Row forcomponent: (Nsinteger) component
{
if (component = = 0) {
return [_protitlelist Objectatindex:row];
} else {
return [_protimelist Objectatindex:row];
}
}
Once you have completed the above code, we can run the Project view effect
The following figure:
