NSButton的各种边框样式（NSBezelStyle）

button在开发中是个很常用的控件，为了美观有时我们会设置，button的BezlStyle，就是边框样式，一下是一些系统提供的button的边框样式,仅供大家参考：

typedef NS_ENUM(NSUInteger, NSBezelStyle) {

NSBezelStyleRounded           = 1,

NSBezelStyleRegularSquare     = 2,

NSBezelStyleDisclosure        = 5,

NSBezelStyleShadowlessSquare  = 6,

NSBezelStyleCircular          = 7,

NSBezelStyleTexturedSquare    = 8,

NSBezelStyleHelpButton        = 9,

NSBezelStyleSmallSquare       = 10,

NSBezelStyleTexturedRounded   = 11,

NSBezelStyleRoundRect         = 12,

NSBezelStyleRecessed          = 13,

NSBezelStyleRoundedDisclosure = 14,

NSBezelStyleInline NS_ENUM_AVAILABLE_MAC(10_7) = 15,

};

NSBezelStyleRounded NSBezelStyleRegularSquare NSBezelStyleDisclosure NSBezelStyleShadowlessSquare NSBezelStyleCircular NSBezelStyleTexturedSquare NSBezelStyleHelpButton NSBezelStyleSmallSquare NSBezelStyleTexturedRounded NSBezelStyleRoundRect NSBezelStyleRecessed NSBezelStyleRoundedDisclosure NSBezelStyleInline