首先添加拖动手势:

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(completeAction:)];    [music addGestureRecognizer:pan];

//CGAffineTransformRotate(view.transform, minus*M_PI/180) 是在原来的角度上进行追加，CGAffineTransformMakeRotation(180*M_PI/180)直接旋转成某个角度。- (void)completeAction:(UISwipeGestureRecognizer *)sender {    switch (sender.state) {        case UIGestureRecognizerStateBegan:        {            startPoint = [sender locationInView:self.view];        }            break;        case UIGestureRecognizerStateChanged:        {            CGPoint point = [sender locationInView:self.view];            CGFloat minus = point.x - startPoint.x;            startPoint = point;            angle += minus*M_PI/180;            CGAffineTransform trans = CGAffineTransformRotate(view.transform, minus*M_PI/180); //            view.transform = trans;        }            break;        case UIGestureRecognizerStateEnded:        {            if (angle > 0.5) {                [UIView animateWithDuration:1 delay:0 usingSpringWithDamping:0.3 initialSpringVelocity:0 options:0 animations:^{                    view.transform = CGAffineTransformMakeRotation(180*M_PI/180);                } completion:^(BOOL finished) {                    [view removeFromSuperview];                    view = nil;                }];            } else {                view.transform = CGAffineTransformMakeRotation(0);            }            angle = 0;        }            break;        default:            break;    }}

以任意点进行旋转

- (void)setAnchorPoint:(CGPoint)anchorpoint forView:(UIView *)view{    CGRect oldFrame = view.frame;    view.layer.anchorPoint = anchorpoint;    view.frame = oldFrame;}

tabbar创建

- (void)viewDidLoad {    [super viewDidLoad];    NSArray *childItemsArray = @[                                 @{kClassKey  : @"HomeViewController",                                   kTitleKey  : @"微信",                                   kImgKey    : @"tabbar_mainframe",                                   kSelImgKey : @"tabbar_mainframeHL"},                                 @{kClassKey  : @"ContactsViewController",                                   kTitleKey  : @"通讯录",                                   kImgKey    : @"tabbar_contacts",                                   kSelImgKey : @"tabbar_contactsHL"},                                 @{kClassKey  : @"DiscoverViewController",                                   kTitleKey  : @"发现",                                   kImgKey    : @"tabbar_discover",                                   kSelImgKey : @"tabbar_discoverHL"},                                 @{kClassKey  : @"MeViewController",                                   kTitleKey  : @"我",                                   kImgKey    : @"tabbar_me",                                   kSelImgKey : @"tabbar_meHL"} ];    [childItemsArray enumerateObjectsUsingBlock:^(NSDictionary *dict, NSUInteger idx, BOOL *stop) {        UIViewController *vc = [NSClassFromString(dict[kClassKey]) new];        vc.title = dict[kTitleKey];        BaseNavigationController *nav = [[BaseNavigationController alloc] initWithRootViewController:vc];        UITabBarItem *item = nav.tabBarItem;        item.title = dict[kTitleKey];        item.image = [UIImage imageNamed:dict[kImgKey]];        item.selectedImage = [[UIImage imageNamed:dict[kSelImgKey]] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];        [item setTitleTextAttributes:@{NSForegroundColorAttributeName : kThemeColor} forState:UIControlStateSelected];        [self addChildViewController:nav];    }];    self.selectedIndex = 1;}