swift Tips(version1.2 xcode6.4)

1

颜色转图片

extension UIImage{    static func ls_imageWithColor(color: UIColor) -> UIImage    {        let imageSize = CGSizeMake(1, 1);        UIGraphicsBeginImageContextWithOptions(imageSize, true, 0);        color.set();        let path = UIBezierPath(rect: CGRectMake(0, 0, imageSize.width, imageSize.height))        path.fill()        let image = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()        return image    }    }

 2

方向

    // MARK: - Orientations    override func shouldAutorotate() -> Bool {        return true    }        override func supportedInterfaceOrientations() -> Int {        return UIInterfaceOrientationMask.Portrait.rawValue.hashValue    }

 3

 swift 调用oc枚举不识别

typedef NS_ENUM(NSInteger, EZCameraState){    EZCameraStateFront,    EZCameraStateBack};

 改成：

typedef NS_ENUM(NSInteger, EZCameraState){    Front,    Back};

 4

背景图片不要用(其实以前也是)：

 

        self.view.backgroundColor = UIColor(patternImage: UIImage(named: "videoAotu")!)//patternImage耗内存

用：

 

        self.view.layer.contents = UIImage(named: "videoAotu")?.CGImage

5

oc中的#pragma mark  在swift中是：//MARK:    其他还有 //TODO:、//FIXME。

6

 在子类必须实现的方法中调用这个函数fatalError("方法未实现")。使用了fatalError方法的地方编译可过。但是在运行的时候会报错！

7

swift1.2中没有appearanceWhenContainedIn:方法 http://justsee.iteye.com/blog/2227009

 8

swift单例

class LSHostAppManager{        class func shareInstance()->LSHostAppManager{        struct LSSingleton{            static var predicate:dispatch_once_t = 0            static var instance:LSHostAppManager? = nil        }        dispatch_once(&LSSingleton.predicate,{            LSSingleton.instance=LSHostAppManager()            }        )        return LSSingleton.instance!    }}

 

struct StructSingleton{    static func shareInstance()->StructSingleton{        struct YRSingleton{            static var predicate:dispatch_once_t = 0            static var instance:StructSingleton? = nil        }        dispatch_once(&YRSingleton.predicate,{                YRSingleton.instance=StructSingleton()            }        )        return YRSingleton.instance!    }}

 http://www.cocoachina.com/industry/20140620/8894.html