How IOS achieves simple drawer effects with 100 lines of code _ios

Objective

The simple implementation of iOS drawer effect is now used in many applications, the Internet also has a lot of examples, this article is mainly through a number of simple code to achieve, there is a need to learn together.

Here is the effect chart

The sample code is as follows

#import <UIKit/UIKit.h>

@interface mainviewcontroller:uiviewcontroller
+ (instancetype) Mainviewcontrollerwithleftviewcontroller: (Uiviewcontroller *) Leftviewcontroller Withmainpageviewcontroller: ( Uiviewcontroller *) Mainpageviewcontroller;
@end

#import "MainViewController.h" #define Kwidth self.view.frame.size.width #define Kheight self.view.frame.size.height @
Interface Mainviewcontroller () @property (Nonatomic,strong) Uiviewcontroller *LEFTVC;
@property (Nonatomic,strong) Uiviewcontroller *centervc;
@property (nonatomic,assign) BOOL Isslider;
@property (Nonatomic,strong) UIView *corverview; @end @implementation Mainviewcontroller + (instancetype) Mainviewcontrollerwithleftviewcontroller: (Uiviewcontroller *) Leftviewcontroller Withmainpageviewcontroller: (Uiviewcontroller *) mainpageviewcontroller{MainViewController *
  MAINVC = [[Mainviewcontroller alloc] init];
  MAINVC.LEFTVC = Leftviewcontroller;
  MAINVC.CENTERVC = Mainpageviewcontroller;
return MAINVC;
  }-(void) viewdidload{[Super Viewdidload];
  Self.isslider = NO;
  Self.view.backgroundColor = [Uicolor Whitecolor];
  [Self AddChildViewController:self.leftVC];
  [Self.view AddSubview:self.leftVC.view];
  [Self AddChildViewController:self.centerVC]; [Self.view AddSubview:self.centerVC.view];
Add gestures to the left and main view [self addgestureforview];
    ///Add a mask to the main view-(void) addcorverview{if (Self.corverview) {[Self.corverview Removefromsuperview];
  Self.corverview = nil;
  } Self.corverview = [[UIView alloc] initWithFrame:self.centerVC.view.bounds];
  _corverview.backgroundcolor = [[Uicolor blackcolor] colorwithalphacomponent:0.0];
[Self.centerVC.view AddSubview:self.corverView];
    //Remove main view cover-(void) removecoverview{if (Self.corverview) {[Self.corverview Removefromsuperview];
  Self.corverview = nil; ///To add gestures to the left and main view-(void) addgestureforview{uiswipegesturerecognizer *rightgesture = [[Uiswipegesturerecognizer alloc
  ] initwithtarget:self action: @selector (swiperightaction:)];
  Rightgesture.direction = Uiswipegesturerecognizerdirectionright;
  [Self.centerVC.view Addgesturerecognizer:rightgesture]; Uiswipegesturerecognizer *leftgesture = [[Uiswipegesturerecognizer alloc] initwithtarget:self action: @selector (
 Swipeleftaction:)]; Leftgesture.direction = Uiswipegesturerecognizerdirectionleft;
  [Self.centerVC.view Addgesturerecognizer:leftgesture]; Uiswipegesturerecognizer *leftvcleftswipegesture = [[Uiswipegesturerecognizer alloc] initwithtarget:self action:@
  Selector (leftvcleftswipeaction:)];
  Leftvcleftswipegesture.direction = Uiswipegesturerecognizerdirectionleft;
[Self.leftVC.view Addgesturerecognizer:leftvcleftswipegesture];
  }-(void) Swiperightaction: (ID) sender{[self MoveView:self.centerVC.view scale:0.8 panvalue:kwidth];
  Self.isslider = YES;
[Self addcorverview];
  }-(void) Swipeleftaction: (ID) sender{[self MoveView:self.centerVC.view scale:1 PANVALUE:KWIDTH/2];
  Self.isslider = NO;
[Self removecoverview];
  }-(void) Leftvcleftswipeaction: (ID) sender{[self MoveView:self.centerVC.view scale:1 PANVALUE:KWIDTH/2];
  Self.isslider = NO;
[Self removecoverview]; //pan and Zoom one view-(void) Moveview: (UIView *) View scale: (cgfloat) scale panvalue: (cgfloat) value{[UIView Beginanimations:ni L ContExt:nil];
  View.transform = Cgaffinetransformscale (Cgaffinetransformidentity,scale,scale);
  View.center = Cgpointmake (value, VIEW.CENTER.Y);
[UIView commitanimations]; } @end

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