ALButton是UIButton的子类，添加了一些功能，减少UIButton自定义外观和行为的行数，并且添加了一些Swfit的优势。
三种初始化方式：
//- 1. Full Initializationlet style = ALButton.ButtonStyle()//-- set stylelet myButton = ALButton(title: "Button Title", style: style, touchUpInsideHandler: { (sender ) in //-- Implement touch up inside event here})//- 2. Simple initialization with style:var style = ALButton.ButtonStyle()//-- set stylelet myButton = ALButton(title: "Button Title", style: style)//- 3. Short initializationlet myButton = ALButton(title: "Button Title")
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