iOS homemade controls similar to drop-down boxes

Recently done in the logistics of the app, the number of units of goods to be selected in a given range (such as: Ton, Fang, pieces), but iOS does not resemble Android in the dropdown box, I think of the way to self-made one, the effect is satisfactory; The project team of the undergraduate will help me do iOS development, Thank you here!!!

The first step: New Project Xialakuang (the name is more vulgar, the new method is no longer the same ...) ）

Step Two: Operation Main.storyboard

--"Drag a UIButton (named title" Ton ", background for" light gray ", alignment in the horizonal choose left), and then drag a uiimage image as a triangular arrow picture, Make the button look like a drop-down box;

Note: In the future, clicking this button will bring up the selector, and after selecting the content, it will change the title of the button to the content of our selection;

---"Drag a toolbar, Pickerview control to the bottom of the button (a little bit smaller, after all, we choose a few things), and then drag an item control to toolbar to" done ", or you can drag a flexible to the left of item. Space makes the "Finish" button on the right, and then toolbar and Pickerview's hidden tick;

After the completion of the following:

Step three: wiring (between control and VIEWCONTROLLER.M)

--"UIButton connect two lines, a outlet" button ", an action" btnaction ";

-"Toolbar a outlet" Toolbar ";

-"Uipickerview a outlet" picker ";

--"Complete" button on toolbar with an action "selectedaction";

---"to Pickerview connect DataSource and Delegate;(method and the same way as UITableView to display list data, see my previous blog)

Fourth step: Encode

#import "ViewController.h"@interfaceViewcontroller () <UIPickerViewDelegate,UIPickerViewDataSource>@property (Weak, nonatomic) Iboutlet UIButton*danweibtn;-(Ibaction) Btnaction: (IDsender; @property (weak, nonatomic) Iboutlet Uitoolbar*Toolbar, @property (weak, nonatomic) Iboutlet Uipickerview*Picker;-(Ibaction) Selectedaction: (ID) sender; @property (nonatomic, strong) Nsarray*Danwei;@end@implementationViewcontroller- (void) viewdidload {[Super viewdidload]; //additional setup after loading the view, typically from a nib._danwei = [Nsarray arraywithobjects:@"tons",@"Square",@"pieces", nil];}-(Nsinteger) Numberofcomponentsinpickerview: (Uipickerview *) pickerview{return 1;}-(Nsinteger) Pickerview: (Uipickerview *) Pickerview numberofrowsincomponent: (nsinteger) component{return_danwei.count;}-(NSString *) Pickerview: (Uipickerview *) Pickerview Titleforrow: (nsinteger) Row forcomponent: (nsinteger) component{return[_danwei Objectatindex:row];}- (void) Pickerview: (Uipickerview *) Pickerview Didselectrow: (nsinteger) Row incomponent: (Nsinteger) component{[self.danweibtn SetTitle:[_danwei Objectatindex:row] forstate:uicontrolstatenormal];}- (void) didreceivememorywarning {[Super didreceivememorywarning]; //Dispose of any resources the can be recreated.}-(Ibaction) Btnaction: (IDSender {self. Picker.hidden=NO; Self. Toolbar.hidden=NO;}-(Ibaction) Selectedaction: (IDSender {self. Picker.hidden=YES; Self. Toolbar.hidden=YES;}@end

Eventually:

Did not do that black triangular pattern rotation, usually if you click the drop-down box after the triangle will rotate; interested friends can try

    Triangle picture. Transform = Cgaffinetransformmakerotation (M_PI);

iOS homemade controls similar to drop-down boxes