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How to replace these screen sizes and device type with macros in Swift?

In Objective-C, I defined the following macros in a file constants.h:

#define IS_IPHONE5 (([[UIScreen mainScreen] bounds].size.height-568)?NO:YES)
#define IS_IPAD    (UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPad)
#define IS_IOS7 ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7)
#define APP_DEFAULT_FONT_FACE @"HelveticaNeue-Light"
#define APP_DEFAULT_FONT_FACE_THIN @"HelveticaNeue-UltraLight"
#define APP_VERSION @"1.2"

I started playing with Swift, and I noticed that these things just didn't work. So, how do I define these macros and determine which family the device belongs to?

And if Swift doesn't have macros, what is the syntax for this?

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3 answers

In this case, the easiest way to determine these constants is to use a keyword let. Macros are not available in Swift, so in this case you should use constants (which might be better in terms of performance in this case):

let IS_IPHONE5 = fabs(UIScreen.mainScreen().bounds.size.height-568) < 1;      
let IS_IPAD = (UI_USER_INTERFACE_IDIOM()==UIUserInterfaceIdiomPad);
let IS_IOS8 = (UIDevice.currentDevice().systemVersion.floatValue >= 8)
let APP_DEFAULT_FONT_FACE_NAME = "HelveticaNeue-Light";
let APP_DEFAULT_FONT_FACE_THIN_NAME = "HelveticaNeue-UltraLight";
let APP_VERSION_STRING = "1.2";

IS_IPHONE5, fabs, . , , ...

IS_IOS7 Swift, Swift iOS 7 (IS_IOS7 YES Swift.) IS_IOS8...

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, :

struct ScreenSize {
    static let SCREEN_WIDTH         = UIScreen.mainScreen().bounds.size.width
    static let SCREEN_HEIGHT        = UIScreen.mainScreen().bounds.size.height
    static let SCREEN_MAX_LENGTH    = max(ScreenSize.SCREEN_WIDTH, ScreenSize.SCREEN_HEIGHT)
    static let SCREEN_MIN_LENGTH    = min(ScreenSize.SCREEN_WIDTH, ScreenSize.SCREEN_HEIGHT)
}

struct DeviceType {
    static let IS_IPHONE_4_OR_LESS  = UIDevice.currentDevice().userInterfaceIdiom == .Phone && ScreenSize.SCREEN_MAX_LENGTH < 568.0
    static let IS_IPHONE_5          = UIDevice.currentDevice().userInterfaceIdiom == .Phone && ScreenSize.SCREEN_MAX_LENGTH == 568.0
    static let IS_IPHONE_6          = UIDevice.currentDevice().userInterfaceIdiom == .Phone && ScreenSize.SCREEN_MAX_LENGTH == 667.0
    static let IS_IPHONE_6P         = UIDevice.currentDevice().userInterfaceIdiom == .Phone && ScreenSize.SCREEN_MAX_LENGTH == 736.0
    static let IS_IPAD              = UIDevice.currentDevice().userInterfaceIdiom == .Pad && ScreenSize.SCREEN_MAX_LENGTH == 1024.0
}

struct iOSVersion {
    static let SYS_VERSION_FLOAT = (UIDevice.currentDevice().systemVersion as NSString).floatValue
    static let iOS7 = (iOSVersion.SYS_VERSION_FLOAT < 8.0 && iOSVersion.SYS_VERSION_FLOAT >= 7.0)
    static let iOS8 = (iOSVersion.SYS_VERSION_FLOAT >= 8.0 && iOSVersion.SYS_VERSION_FLOAT < 9.0)
    static let iOS9 = (iOSVersion.SYS_VERSION_FLOAT >= 9.0 && iOSVersion.SYS_VERSION_FLOAT < 10.0)
}

:

if DeviceType.IS_IPHONE_6 {
    //iPhone 6 specific code goes here.
}
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IPad:

static let IS_IPAD = UIDevice.currentDevice().userInterfaceIdiom == .Pad && ScreenSize.SCREEN_MAX_LENGTH >= 1024.0
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