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Pass by value summary demo for iOS/OSX.

界面传值几种方法

1.属性传值

svc.属性 = 需要传进去的值

2.方法传值

[[SecondViewController alloc]initWithValue:_txtFiled.text];（init传进去就行了）

3.Delegate

[self method_delegate];

4.Notification

[self method_notification];

5.block

[self method_block];

6.单例

[self method_singleton];

7.NSUserDefault

[self method_NSUserdefault];