Swift与OC转换

1、获取对象类型

OC：

NSDate* date = [NSDatedate];
NSLog(@"%@",NSStringFromClass([date class]));

Swift：
letdate =NSDate()
letname = date.dynamicType

共有：
let name:AnyClass! = object_getClass(date)

2、函数入参中对象转化

OC转Swift，对象变为可选类型

Swift转OC，不用改变

3、枚举

1）Swift按位操作使用OptionSetType

struct MyOptions : OptionSetType {
let rawValue: Int

static let None         = MyOptions(rawValue: 0)
static let FirstOption  = MyOptions(rawValue: 1 << 0)
static let SecondOption = MyOptions(rawValue: 1 << 1)
static let ThirdOption  = MyOptions(rawValue: 1 << 2)
}

[/code]

Now we can use set-based semantics with 

MyOptions

:

let singleOption = MyOptions.FirstOption
let multipleOptions: MyOptions = [.FirstOption, .SecondOption]
if multipleOptions.contains(.SecondOption) {

    print("multipleOptions has SecondOption")
}
let allOptions = MyOptions(rawValue: 7)
if allOptions.contains(.ThirdOption) {

    print("allOptions has ThirdOption")

}

2）OC调用Swift，只需增加前缀

@objc

@objc enum Bear: Int {
case Black, Grizzly, Polar
}

[/code]

Shamelessly taken from the Swift Blog

In Objective-C this would look like

Bear type = BearBlack;
switch (type) {

    case BearBlack:

    case BearGrizzly:

    case BearPolar:

       [self runLikeHell];
}

3）Swift调用OC直接使用rawValue