iOS如何实现侧滑菜单

这篇文章主要介绍iOS如何实现侧滑菜单，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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首先简单说一下我实现的原理：需要两个UIView，一个是放在中间的CenterView，另一个是滑动时左边显示出来的LeftView。先把LeftView添加到ViewController中，然后再添加CenterView，这样CenterView就把LeftView给盖住了，一开始看到的自然就是CenterView了。因为滑动是在CenterView上进行的，因此需要对CenterView添加手势识别，滑动时改变CenterView中心点的坐标，这样被覆盖住的LeftView就显示出来了。这个就是实现的基本原理，下面我进行详细的分析。

我们先看LeftView，为了和CenterView区分，我把它的背景设为红色，然后中间放了一个按钮：

LeftView.h

//
//  LeftView.h
//  SlideView
//
//  Created by hejinlai on 13-8-13.
//  Copyright (c) 2013年 yunzhisheng. All rights reserved.
//
#import 
@interface LeftView : UIView
@end

LeftView.m

//
//  LeftView.m
//  SlideView
//
//  Created by hejinlai on 13-8-13.
//  Copyright (c) 2013年 yunzhisheng. All rights reserved.
//
#import "LeftView.h"
@implementation LeftView
- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
                                                                                                                                                                                                                                                                                                                                                                                                            
        self.backgroundColor = [UIColor redColor];
                                                                                                                                                                                                                                                                                                                                                                                                           
                                                                                                                                                                                                                                                                                                                                                                                                            
        UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        btn.frame = CGRectMake(0, 0, 100, 50);
        [btn setTitle:@"LeftView" forState:UIControlStateNormal];
        btn.center = CGPointMake(140, 264);
        [btn addTarget:self action:@selector(onClick:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:btn];
                                                                                                                                                                                                                                                                                                                                                                                                            
    }
    return self;
}
- (void)onClick:(UIButton *)button
{
    NSLog(@"LeftView button pressed!");
}
@end

再来看CenterView，首先声明了屏幕的中心点坐标和一个手势识别：

#import 
@interface CenterView : UIView
{
    UIPanGestureRecognizer *panGestureRecognizer;
    float centerX;
    float centerY;
}
@end

在CenterView初始化的时候，计算屏幕中心点坐标，设置背景为绿色，添加左上角按钮和手势识别

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
                                                                                                                                                                                                                                                                                                                     
        CGRect screen = [[UIScreen mainScreen] bounds];
        centerX = screen.size.width / 2;
        centerY = screen.size.height / 2;
                                                                                                                                                                                                                                                                                                                     
        self.backgroundColor = [UIColor greenColor];
                                                                                                                                                                                                                                                                                                                     
        // 左上角按钮
        UIButton *leftUpBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        leftUpBtn.frame = CGRectMake(10, 10, 40, 40);
        [leftUpBtn addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self addSubview:leftUpBtn];
                                                                                                                                                                                                                                                                                                                     
        panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
        [self addGestureRecognizer:panGestureRecognizer];
    }
    return self;
}

CenterView最终位置实际上有两个：第一个位置是充满整个屏幕，此时它的中心点就是屏幕的中心，把LeftView整个遮住；第二个位置是中心点在右边，而左边只露出一小部分在屏幕中，这样底部的LeftView就可以显示出来。

我把CenterView最右边的中心点横坐标的位置设为420，相当于CenterView左边露出了60大小在屏幕中。还有一个问题是，滑动停止时，CenterView回到第一个位置还是第二个位置？这里我设置了一个边界值280，如果中心点横坐标小于280就回到第一个位置，大于280就回到第二个位置，下面是这两个常量的定义：

#define MAX_CENTER_X 420
#define BOUND_X 280

当然这两个值可以根据自己的需要进行调整。

CenterView左上角按钮点击时，需要在两个位置之间进行切换，即如果此时是第一个位置要回到第二个位置，第二个位置要回到第一个位置：

- (void)buttonPressed:(UIButton *)button
{
    [UIView animateWithDuration:0.2 animations:^(void){
                                                                                                                 
        if (self.center.x == centerX) {
            self.center = CGPointMake(MAX_CENTER_X, centerY);
        }else if (self.center.x == MAX_CENTER_X){
            self.center = CGPointMake(centerX, centerY);
        }
                                                                                                                 
    }];
                                                                                                             
}

为了看起来比较平滑，加入了动画效果。

接下来我们看下滑动时处理的逻辑。首先是计算出滑动后的中心点横坐标：

CGPoint translation = [recognizer translationInView:self];
    float x = self.center.x + translation.x;

由于CenterView是不能移到左边的，即CenterView中心点横坐标最小值为centerX，当中心点坐标小于这个值时，需要重置：

if (x < centerX) {
        x = centerX;
    }
    self.center = CGPointMake(x, centerY);

当滑动结束的时候，需要判断此时中心点左边落到那个区域，如果小于边界值，则回到第一个位置，大于边界值则回到第二个位置，为了看起来比较平滑，加入了动画效果：

if (recognizer.state == UIGestureRecognizerStateEnded) {
                                           
        [UIView animateWithDuration:0.2 animations:^(void){
                                               
            if (x > BOUND_X) {
                self.center = CGPointMake(MAX_CENTER_X, centerY);
            }else{
                self.center = CGPointMake(centerX, centerY);
            }
                                               
        }];
                                           
                                           
    }
                                       
    [recognizer setTranslation:CGPointZero inView:self];

最后在ViewController加入这两个UIVIew，注意先添加LeftView，然后再添加CenterView：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
                                  
    CGRect screen = [[UIScreen mainScreen] bounds];
    CGFloat width = screen.size.width;
    CGFloat height = screen.size.height;
                                  
    leftView = [[LeftView alloc] init];
    leftView.frame = CGRectMake(0, 0, width, height);
    [self.view addSubview:leftView];
                                  
    centerView = [[CenterView alloc] init];
    centerView.frame = CGRectMake(0, 0, width, height);
    [self.view addSubview:centerView];
}

运行结果：

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