效果

源码：https://github.com/YouXianMing/iOS-Project-Examples 中的 SideViewController

//// ViewController.m// SideViewController//// Created by YouXianMing on 16/6/6.// Copyright © 2016年 YouXianMing. All rights reserved.//#import "ViewController.h"#import "LeftViewController.h"#import "MainViewController.h"#import "UIView+SetRect.h"@interface ViewController () { CGFloat _screenWidth;}@property (nonatomic, strong) UIPanGestureRecognizer *panGesture;@property (nonatomic) CGPoint panBeginPoint;@property (nonatomic, strong) LeftViewController *leftViewController;@property (nonatomic, strong) UIView *leftView;@property (nonatomic, strong) MainViewController *mainViewController;@property (nonatomic, strong) UIView *mainView;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Init some value. _screenWidth = Width; // Add backgroundView. UIImageView *backgroundView = [[UIImageView alloc] initWithFrame:self.view.bounds]; backgroundView.image = [UIImage imageNamed:@"back"]; [self.view addSubview:backgroundView]; // LeftViewController self.leftViewController = [[LeftViewController alloc] init]; self.leftView = self.leftViewController.view; [self.view addSubview:self.leftView]; // MainViewController self.mainViewController = [[MainViewController alloc] init]; self.mainView = self.mainViewController.view; [self.view addSubview:self.mainView]; // Pan gesture. self.panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureEvent:)]; [self.mainView addGestureRecognizer:self.panGesture];}- (void)panGestureEvent:(UIPanGestureRecognizer *)gesture { CGPoint translation = [gesture translationInView:gesture.view]; CGPoint velocity = [gesture velocityInView:gesture.view]; CGFloat gap = _screenWidth / 3.f * 2; CGFloat sensitivePosition = _screenWidth / 2.f; if (velocity.x < 0 && _mainView.x <= 0) { // 过滤掉向左侧滑过头的情形 _mainView.x = 0.f; } else { if (gesture.state == UIGestureRecognizerStateBegan) { // 开始 _panBeginPoint = translation; if (_mainView.x >= sensitivePosition) { _panBeginPoint.x -= gap; } } else if (gesture.state == UIGestureRecognizerStateChanged) { // 值变化 _mainView.x = translation.x - _panBeginPoint.x; if (_mainView.x <= 0) { // 过滤掉向左侧滑过头的情形 _mainView.x = 0.f; } } else if (gesture.state == UIGestureRecognizerStateEnded) { // 结束 [UIView animateWithDuration:0.20f animations:^{ _mainView.x >= sensitivePosition ? (_mainView.x = gap) : (_mainView.x = 0); }]; } }}@end

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