摘要：
Initializing a View Object //初始化view- (id)initWithFrame:(CGRect)aRect //通过一个矩形对象初始化Configuring a View’s Visual Appearance //配置视觉展示@property(nonatomic, copy) UIColor *backgroundColor //设置背景色@property(nonatomic, getter=isHidden) BOOL hidden //隐藏view，默认为NO@property(nonatomic) CGFloat alpha //设置透明度，0.0至 阅读全文
