1.简单写法
private lazy var imageArr: NSMutableArray = NSMutableArray()
private lazy var dataArr: NSMutableArray = NSMutableArray()
2.闭包
private lazy var customView: UIView = {
let customView = UIView(frame:CGRectMake(0,0,W,H))
customView.backgroundColor = UIColor.whiteColor()
customView.alpha = 0.0
return customView
}()
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