An iOS drop down menu with pretty animation.

####!Try the demo. It's really helpful!

1. Create your IGLDropDownItem array and set up

   NSMutableArray *dropdownItems = [[NSMutableArray alloc] init];
   IGLDropDownItem *item = [[IGLDropDownItem alloc] init];
   [item setIconImage:[UIImage imageNamed:@"icon.png"]];
   [item setText:@"title"];
   [dropdownItems addObject:item];

2. Create your IGLDropDownMenu and set the up the parameter name dropDownItems

   IGLDropDownMenu *dropDownMenu = [[IGLDropDownMenu alloc] init];
   [dropDownMenu setFrame:CGRectMake(0, 0, 200, 45)];
   dropDownMenu.menuText = @"Choose Weather";
   dropDownMenu.menuIconImage = [UIImage imageNamed:@"chooserIcon.png"]];
   dropDownMenu.paddingLeft = 15;  // padding left for the content of the button

3. modify the params of IGLDropDownMenu

   dropDownMenu.type = IGLDropDownMenuTypeStack;
   dropDownMenu.gutterY = 5;
   dropDownMenu.itemAnimationDelay = 0.1;
   dropDownMenu.rotate = IGLDropDownMenuRotateRandom;

4. Call the reloadView method (Very Important!)

   // every time you change the params you should call reloadView method
   [dropDownMenu reloadView];

These are just some of the parameters you can use, you can find more(or make more) in the code.

####For IGLDropDownMenu

• animationDuration set the duration(s) of the animation in second

• animationOption set the UIViewAnimationOptions for the animation

• itemAnimationDelay set the delay(s) before each of item start to animate

• direction set the direction when the menu expand

• IGLDropDownMenuDirectionDown default value, expand downward
• IGLDropDownMenuDirectionUp expand upward

• rotate set the rotate style when the menu on expand

• IGLDropDownMenuRotateNone default value, for no rotate
• IGLDropDownMenuRotateLeft rotate to left on expand
• IGLDropDownMenuRotateRight rotate to right on expand
• IGLDropDownMenuRotateRandom rotate random on expand every single time

• type set the menu type (remember when you set the type to SlidingIn* you can't have the rotate type at the same time.)

• IGLDropDownMenuTypeNormal default value, item will hide behind the menu button on fold
• IGLDropDownMenuTypeStack item will hide behind the menu button and make a stack like look
• IGLDropDownMenuTypeSlidingInBoth item will slide in and out from both sides
• IGLDropDownMenuTypeSlidingInFromLeft item will slide in from left
• IGLDropDownMenuTypeSlidingInFromRight item will slide in from right

• slidingInOffset set the offset value for the items slide in and out
• gutterY set the Y gutter between items
• alphaOnFold set the item alpha value when menu on fold, only use this when the style won't fit your mind
• flipWhenToggleView when you set this to true, the menu button will flip up when you click
• useSpringAnimation use the spring animation for iOS7 or higher version, default is true

####For IGLDropDownItem

• iconImage set the icon image for the item
• text set the text string for the item
• textLabel for you to adjust the text label style
• object you can store your custom item in this preporty

Remember the menuButton in IGLDropDownMenu is also an IGLDropDownItem.

• target platform: >=iOS 6.0 (I never test the version below 6.0, maybe you can make some try and tell me.)
• ARC

1. make IGLDropDownItem more customizable
2. add the spring animation for iOS 7 or higher version
3. add more animation effect for the menu
4. just contact me and tell me more

This drop-down menu idea is come from here, I found this demo one day and just implement it on iOS.

The MIT License (MIT)

Copyright (c) 2014 Galvin Li

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.