简单的动画实现

目前动画只支持UIView的几个简单的animate，是通过扩展的方式接入的，直接上代码：
1：接入代码

- (instancetype)init
{
    if (self = [super init]) {
        _viewControllers = [NSMapTable strongToWeakObjectsMapTable];
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(njcsViewControllerDealloc:) name:NJCSVIEWCONTROLLER_DEALLOC object:nil];
        _njcsJSContext = [[NJCS_JSContext alloc] init];
        _njcsJSContext.jscontext[@"NJCSBridge_Native"] = self;

        self.macors = [[NJCSMacors alloc] init];
        self.njcsHttp = [[NJCSHttp alloc] init];
        self.viewAnimate = [[NJCSViewAnimate alloc] init];
        self.modelAdapter = [[NJCSModelAdapter alloc] init];
        self.notifyManager = [NJCSNotificationManager sharedManager];
        self.njcsAlert = [NJCSAlert shareInstance];
    }

    return self;
}

viewAnimate是做为必接扩展添加进去的，是用户必须实现的。
对外公开的几个方法如下：

- (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^ _Nullable)(void))animations
{
    [UIView animateWithDuration:duration animations:animations];
}

- (void)animateWithDuration:(NSTimeInterval)duration animations:(void (^ _Nullable)(void))animations completion:(void (^ _Nullable)(BOOL))completion
{
    [UIView animateWithDuration:duration animations:animations completion:completion];
}

- (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^ _Nullable)(void))animations completion:(void (^ _Nullable)(BOOL))completion
{
    [UIView animateWithDuration:duration delay:delay options:options animations:animations completion:completion];
}

都是些很简单的实现，这里就不详细介绍了。