Basic OperatorsAn operator is a special symbol or phrase that you use to check, change, or combine values.Swift supports

可变字典中setValue:forKey和setObject:forKey的区别在开发过程中，使用字典的频率也是非常高的，也经常会遇到一个类似-[__NSPlaceholderDictionary initWithObjects:forKe

UIStackView

AttributesThere are two kinds of attributes in Swift—those that apply to declarations and those that apply to types. An

MethodsMethods are functions that are associated with a particular type. Classes, structures, and enumerations can all d

参考文档：设置不同section中cell的圆角UITableView对每一组（section）设置圆角Swift - 实现tableView中section分组圆角效果2（含有分区头、尾的情况 自定义collectionLayout横向排

Properties associate values with a particular class, structure, or enumeration.Stored properties store constant and vari

Comparing Structures and ClassesStructures and classes in Swift have many things in common. Both can: Define properties

左右的相互调换，使用系统提供的镜像功能。 针对全部的UIView 使用镜像功能[UIView appearance].semanticContentAttribute ==UISemanticContentAttributeForceR