ACDDropdownMenu

A simple dropdown menu in navigation.
一个简单的下拉菜单，用于导航栏中。

You can customize almost everything you want custom attributes.
你几乎可以定制一切你希望定制的属性。

// 定制下拉菜单按钮
@property (nonatomic, strong) NSArray *titlesArray;
@property (nonatomic, strong) UIFont *titleFont;
@property (nonatomic, strong) UIColor *titleColor;
@property (nonatomic, strong) UIImage *indicatorImage;
@property (nonatomic, strong) UIColor *indicatorColor;
@property (nonatomic, assign) CGFloat indicatorPadding;
@property (nonatomic, assign) NSTimeInterval animationDuration;
// 定制下拉菜单
@property (nonatomic, assign) BOOL keepMenuCellSelection;
@property (nonatomic, assign) CGFloat menuCellHeight;
@property (nonatomic, assign) UIEdgeInsets menuCellSeparatorInsets;
@property (nonatomic, assign) NSTextAlignment menuCellTextAlignment;
@property (nonatomic, strong) UIFont *menuCellTextFont;
@property (nonatomic, strong) UIColor *menuCellTextColor;
@property (nonatomic, strong) UIColor *menuBackgroundColor;
@property (nonatomic, strong) UIColor *menuCellSelectionColor;
@property (nonatomic, assign) CGFloat menuBackgroundAlpha;

Usage

ACDDropdownMenu *menu =
        [[ACDDropdownMenu alloc] initWithTitle:@"1号动作"
                          navigationController:self.navigationController];
    menu.titlesArray = @[ @"所有文档", @"已签文档", @"原始文档", @"草稿箱" ];
    menu.menuBackgroundAlpha = 0.6;
    menu.delegate = self;
    self.navigationItem.titleView = menu;

Like this~
就像这样~