在写一个项目用RESIDEMENU，这是写得很好的一个开源组件，只需要几行代码就可以使用。所以现在抽空看看代码，看看作者是怎么实现的。
- (void)awakeFromNib {
if (self.contentViewStoryboardID) {
self.contentViewController = [self.storyboard instantiateViewControllerWithIdentifier:self.contentViewStoryboardID];
}
if (self.leftMenuViewStoryboardID) {
self.leftMenuViewController = [self.storyboard instantiateViewControllerWithIdentifier:self.leftMenuViewStoryboardID];
}
if (self.rightMenuViewStoryboardID) {
self.rightMenuViewController = [self.storyboard instantiateViewControllerWithIdentifier:self.rightMenuViewStoryboardID];
}
}
这是.m文件里的第一个方法，很好理解，这是通过storyboard设好ID，然后通过ID初始化三个vc，分别作为内容试图、左视图、右视图。
- (void)viewDidLoad {
[super viewDidLoad];
self.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
self.backgroundImageView = ({
UIImageView *imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];
imageView.image = self.backgroundImage;
imageView.contentMode = UIViewContentModeScaleAspectFill;
imageView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
imageView;
});
self.contentButton = ({
UIButton *button = [[UIButton alloc] initWithFrame:CGRectNull];
[button addTarget:self action:@selector(hideMenuViewController) forControlEvents:UIControlEventTouchUpInside];
button;
});
[self.view addSubview:self.backgroundImageView];
[self.view addSubview:self.menuViewContainer];
[self.view addSubview:self.contentViewContainer];
//重点
self.menuViewContainer.frame = self.view.bounds;
self.menuViewContainer.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
if (self.leftMenuViewController) {
[self addChildViewController:self.leftMenuViewController];
self.leftMenuViewController.view.frame = self.view.bounds;
self.leftMenuViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.menuViewContainer addSubview:self.leftMenuViewController.view];
[self.leftMenuViewController didMoveToParentViewController:self];
}
if (self.rightMenuViewController) {
[self addChildViewController:self.rightMenuViewController];
self.rightMenuViewController.view.frame = self.view.bounds;
self.rightMenuViewController.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.menuViewContainer addSubview:self.rightMenuViewController.view];
[self.rightMenuViewController didMoveToParentViewController:self];
}
self.contentViewContainer.frame = self.view.bounds;
self.contentViewContainer.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self addChildViewController:self.contentViewController];
self.contentViewController.view.frame = self.view.bounds;
[self.contentViewContainer addSubview:self.contentViewController.view];
[self.contentViewController didMoveToParentViewController:self];
self.menuViewContainer.alpha = !self.fadeMenuView ?: 0;
if (self.scaleBackgroundImageView)
self.backgroundImageView.transform = CGAffineTransformMakeScale(1.7f, 1.7f);
[self addMenuViewControllerMotionEffects];
if (self.panGestureEnabled) {
self.view.multipleTouchEnabled = NO;
UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGestureRecognized:)];
panGestureRecognizer.delegate = self;
[self.view addGestureRecognizer:panGestureRecognizer];
}
[self updateContentViewShadow];
}
这是viewdidload里面的代码，可以看看“重点”开始的代码，如果左视图和右视图存在就添加到当前视图。内容视图是一定要有的。其实在看代码前，没想过vc添加vc的，之前都是用view添加view，用得多了，所以思维就有点固化了。RESIDEMENU原理其实很简单，但是如果要做到作者的水平，必须对vc间的关系、动画、手势有相当的积累才可以