现在,如果我想创建一个既能在iPhone 4上运行又能在iPhone 5上运行的应用程序,当然我必须构建两个窗口,但我还必须检测用户是否有3.5英寸或4英寸屏幕的iPhone,然后应用相应的视图。
我该如何做到这一点?
[ [ UIScreen mainScreen ] bounds ].size.height
iPhone 5的屏幕高度为568。
您可以想象一个宏来简化所有这些:
#define IS_IPHONE_5 ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )
fabs
和epsilon一起时,可以避免比较浮点数时出现精度误差,正如H2CO3在评论中指出的那样。if( IS_IPHONE_5 )
{}
else
{}
编辑 - 更好的检测
正如一些人所说,这只能检测宽屏幕,而不能检测实际的iPhone 5。
iPod touch的下一个版本可能也会有这样的屏幕,因此我们可以使用另一组宏。
让我们将原始宏IS_WIDESCREEN
重命名:
#define IS_WIDESCREEN ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )
让我们添加模型检测宏:
#define IS_IPHONE ( [ [ [ UIDevice currentDevice ] model ] isEqualToString: @"iPhone" ] )
#define IS_IPOD ( [ [ [ UIDevice currentDevice ] model ] isEqualToString: @"iPod touch" ] )
IS_IPHONE_5
宏:#define IS_IPHONE_5 ( IS_IPHONE && IS_WIDESCREEN )
nativeBounds
会导致应用程序崩溃。if( [ [ UIScreen mainScreen ] respondsToSelector: @selector( nativeBounds ) ] )
{
/* Detect using nativeBounds - iOS 8 and greater */
}
else
{
/* Detect using bounds - iOS 7 and lower */
}
#define IS_WIDESCREEN_IOS7 ( fabs( ( double )[ [ UIScreen mainScreen ] bounds ].size.height - ( double )568 ) < DBL_EPSILON )
#define IS_WIDESCREEN_IOS8 ( fabs( ( double )[ [ UIScreen mainScreen ] nativeBounds ].size.height - ( double )1136 ) < DBL_EPSILON )
#define IS_WIDESCREEN ( ( [ [ UIScreen mainScreen ] respondsToSelector: @selector( nativeBounds ) ] ) ? IS_WIDESCREEN_IOS8 : IS_WIDESCREEN_IOS7 )
#define IS_IPHONE_5 ( [ [ UIScreen mainScreen ] bounds ].size.height == 568 )
。 - Fabian KreiserDBL_EPSILON
进行比较,并且 ==
比较 不会 失败:只有在浮点值不能表示为一个精确的数字时(例如 1.0/3.0*3.0
),才需要使用此方法进行差值比较。阅读这篇文章以获取更多信息;) - AliSoftware适用于任何SDK和操作系统的组合:
新增iPad类型。 iPad 2和iPad mini是非Retina iPad。而iPad Mini 2及以上,iPad 3, 4, iPad Air, Air 2, Air 3和iPad Pro 9.7 的逻辑分辨率相同为1024。iPad Pro 最大长度为1366。 参考资料
import UIKit
public enum DisplayType {
case unknown
case iphone4
case iphone5
case iphone6
case iphone6plus
case iPadNonRetina
case iPad
case iPadProBig
static let iphone7 = iphone6
static let iphone7plus = iphone6plus
}
public final class Display {
class var width:CGFloat { return UIScreen.main.bounds.size.width }
class var height:CGFloat { return UIScreen.main.bounds.size.height }
class var maxLength:CGFloat { return max(width, height) }
class var minLength:CGFloat { return min(width, height) }
class var zoomed:Bool { return UIScreen.main.nativeScale >= UIScreen.main.scale }
class var retina:Bool { return UIScreen.main.scale >= 2.0 }
class var phone:Bool { return UIDevice.current.userInterfaceIdiom == .phone }
class var pad:Bool { return UIDevice.current.userInterfaceIdiom == .pad }
class var carplay:Bool { return UIDevice.current.userInterfaceIdiom == .carPlay }
class var tv:Bool { return UIDevice.current.userInterfaceIdiom == .tv }
class var typeIsLike:DisplayType {
if phone && maxLength < 568 {
return .iphone4
}
else if phone && maxLength == 568 {
return .iphone5
}
else if phone && maxLength == 667 {
return .iphone6
}
else if phone && maxLength == 736 {
return .iphone6plus
}
else if pad && !retina {
return .iPadNonRetina
}
else if pad && retina && maxLength == 1024 {
return .iPad
}
else if pad && maxLength == 1366 {
return .iPadProBig
}
return .unknown
}
}
在实际操作中查看示例 https://gist.github.com/hfossli/bc93d924649de881ee2882457f14e346
注意:如果例如iPhone 6处于缩放模式,则UI是iPhone 5的缩放版本。这些函数不确定设备类型,而是显示模式,因此在此示例中,iPhone 5是期望的结果。
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_RETINA ([[UIScreen mainScreen] scale] >= 2.0)
#define SCREEN_WIDTH ([[UIScreen mainScreen] bounds].size.width)
#define SCREEN_HEIGHT ([[UIScreen mainScreen] bounds].size.height)
#define SCREEN_MAX_LENGTH (MAX(SCREEN_WIDTH, SCREEN_HEIGHT))
#define SCREEN_MIN_LENGTH (MIN(SCREEN_WIDTH, SCREEN_HEIGHT))
#define IS_ZOOMED (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)
#define IS_IPHONE_4_OR_LESS (IS_IPHONE && SCREEN_MAX_LENGTH < 568.0)
#define IS_IPHONE_5 (IS_IPHONE && SCREEN_MAX_LENGTH == 568.0)
#define IS_IPHONE_6 (IS_IPHONE && SCREEN_MAX_LENGTH == 667.0)
#define IS_IPHONE_6P (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)
使用方法:http://pastie.org/9687735
注意:例如,如果iPhone 6处于缩放模式,则UI是iPhone 5的放大版本。这些功能不确定设备类型,而是显示模式,因此在此示例中期望的结果是iPhone 5。
#define IS_RETINA ([[UIScreen mainScreen] scale] == 2.0)
,它将有助于区分 iPhone4 和 iPhone5 以及 iPad Retina 和非Retina设备。 - bshirley#define IS_IPAD_PRO (IS_IPAD && SCREEN_MAX_LENGTH == 1366.0)
:-) - avdyushin非常简单的解决方案
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
CGSize result = [[UIScreen mainScreen] bounds].size;
if(result.height == 480)
{
// iPhone Classic
}
if(result.height == 568)
{
// iPhone 5
}
}
现在我们需要考虑 iPhone 6 和 6Plus 的屏幕尺寸。这是更新后的答案。
if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
{
//its iPhone. Find out which one?
CGSize result = [[UIScreen mainScreen] bounds].size;
if(result.height == 480)
{
// iPhone Classic
}
else if(result.height == 568)
{
// iPhone 5
}
else if(result.height == 667)
{
// iPhone 6
}
else if(result.height == 736)
{
// iPhone 6 Plus
}
}
else
{
//its iPad
}
一些有用的信息
iPhone 6 Plus 736x414 points 2208x1242 pixels 3x scale 1920x1080 physical pixels 401 physical ppi 5.5"
iPhone 6 667x375 points 1334x750 pixels 2x scale 1334x750 physical pixels 326 physical ppi 4.7"
iPhone 5 568x320 points 1136x640 pixels 2x scale 1136x640 physical pixels 326 physical ppi 4.0"
iPhone 4 480x320 points 960x640 pixels 2x scale 960x640 physical pixels 326 physical ppi 3.5"
iPhone 3GS 480x320 points 480x320 pixels 1x scale 480x320 physical pixels 163 physical ppi 3.5"
我已经将Macmade的宏转换成了一个C函数,并为其命名,因为它检测到了宽屏可用性,但并不一定是iPhone 5。
如果项目中不包括Default-568h@2x.png,宏也无法检测是否在iPhone 5上运行。没有新的默认图像,iPhone 5 将报告常规的480x320点屏幕尺寸。因此,检查不仅仅是检测宽屏可用性,还需要检测启用了宽屏模式。
BOOL isWidescreenEnabled()
{
return (BOOL)(fabs((double)[UIScreen mainScreen].bounds.size.height -
(double)568) < DBL_EPSILON);
}
inline
操作。编译器优化器认为这是一个好主意并且可以知道它是允许的地方,它们也将被内联(例如,函数在同一模块中)。通过函数实现这样的东西有时可能会带来额外的类型检查。 - Ivan Vučica这是我们的代码,在设备或模拟器上,适用于 iPhone4、iPhone5、iPad、iPhone6 和 iPhone6P 的 iOS7 / iOS8 系统通过测试:
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) // iPhone and iPod touch style UI
#define IS_IPHONE_5_IOS7 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 568.0f)
#define IS_IPHONE_6_IOS7 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 667.0f)
#define IS_IPHONE_6P_IOS7 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height == 736.0f)
#define IS_IPHONE_4_AND_OLDER_IOS7 (IS_IPHONE && [[UIScreen mainScreen] bounds].size.height < 568.0f)
#define IS_IPHONE_5_IOS8 (IS_IPHONE && ([[UIScreen mainScreen] nativeBounds].size.height/[[UIScreen mainScreen] nativeScale]) == 568.0f)
#define IS_IPHONE_6_IOS8 (IS_IPHONE && ([[UIScreen mainScreen] nativeBounds].size.height/[[UIScreen mainScreen] nativeScale]) == 667.0f)
#define IS_IPHONE_6P_IOS8 (IS_IPHONE && ([[UIScreen mainScreen] nativeBounds].size.height/[[UIScreen mainScreen] nativeScale]) == 736.0f)
#define IS_IPHONE_4_AND_OLDER_IOS8 (IS_IPHONE && ([[UIScreen mainScreen] nativeBounds].size.height/[[UIScreen mainScreen] nativeScale]) < 568.0f)
#define IS_IPHONE_5 ( ( [ [ UIScreen mainScreen ] respondsToSelector: @selector( nativeBounds ) ] ) ? IS_IPHONE_5_IOS8 : IS_IPHONE_5_IOS7 )
#define IS_IPHONE_6 ( ( [ [ UIScreen mainScreen ] respondsToSelector: @selector( nativeBounds ) ] ) ? IS_IPHONE_6_IOS8 : IS_IPHONE_6_IOS7 )
#define IS_IPHONE_6P ( ( [ [ UIScreen mainScreen ] respondsToSelector: @selector( nativeBounds ) ] ) ? IS_IPHONE_6P_IOS8 : IS_IPHONE_6P_IOS7 )
#define IS_IPHONE_4_AND_OLDER ( ( [ [ UIScreen mainScreen ] respondsToSelector: @selector( nativeBounds ) ] ) ? IS_IPHONE_4_AND_OLDER_IOS8 : IS_IPHONE_4_AND_OLDER_IOS7 )
let IS_IPAD = UIDevice.currentDevice().userInterfaceIdiom == .Pad
let IS_IPHONE = UIDevice.currentDevice().userInterfaceIdiom == .Phone
let IS_RETINA = UIScreen.mainScreen().scale >= 2.0
let SCREEN_WIDTH = UIScreen.mainScreen().bounds.size.width
let SCREEN_HEIGHT = UIScreen.mainScreen().bounds.size.height
let SCREEN_MAX_LENGTH = max(SCREEN_WIDTH, SCREEN_HEIGHT)
let SCREEN_MIN_LENGTH = min(SCREEN_WIDTH, SCREEN_HEIGHT)
let IS_IPHONE_4_OR_LESS = (IS_IPHONE && SCREEN_MAX_LENGTH < 568.0)
let IS_IPHONE_5 = (IS_IPHONE && SCREEN_MAX_LENGTH == 568.0)
let IS_IPHONE_6 = (IS_IPHONE && SCREEN_MAX_LENGTH == 667.0)
let IS_IPHONE_6P = (IS_IPHONE && SCREEN_MAX_LENGTH == 736.0)
#define WIDTH_IPAD 1024
#define WIDTH_IPHONE_5 568
#define WIDTH_IPHONE_4 480
#define HEIGHT_IPAD 768
#define HEIGHT_IPHONE 320
#define IS_IPHONE (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
//width is height!
#define IS_IPHONE_5 ( [ [ UIScreen mainScreen ] bounds ].size.height == WIDTH_IPHONE_5 )
#define IS_IPHONE_4 ( [ [ UIScreen mainScreen ] bounds ].size.height == WIDTH_IPHONE_4 )
#define cp_ph4(__X__, __Y__) ccp(cx_ph4(__X__), cy_ph4(__Y__))
#define cx_ph4(__X__) (IS_IPAD ? (__X__ * WIDTH_IPAD / WIDTH_IPHONE_4) : (IS_IPHONE_5 ? (__X__ * WIDTH_IPHONE_5 / WIDTH_IPHONE_4) : (__X__)))
#define cy_ph4(__Y__) (IS_IPAD ? (__Y__ * HEIGHT_IPAD / HEIGHT_IPHONE) : (__Y__))
#define cp_pad(__X__, __Y__) ccp(cx_pad(__X__), cy_pad(__Y__))
#define cx_pad(__X__) (IS_IPAD ? (__X__) : (IS_IPHONE_5 ? (__X__ * WIDTH_IPHONE_5 / WIDTH_IPAD) : (__X__ * WIDTH_IPHONE_4 / WIDTH_IPAD)))
#define cy_pad(__Y__) (IS_IPAD ? (__Y__) : (__Y__ * HEIGHT_IPHONE / HEIGHT_IPAD))
if ((int)[[UIScreen mainScreen] bounds].size.height == 568)
{
// This is iPhone 5 screen
} else {
// This is iPhone 4 screen
}
UIScreen
进行扩展,如下所示:extension UIScreen {
var isPhone4: Bool {
return self.nativeBounds.size.height == 960;
}
var isPhone5: Bool {
return self.nativeBounds.size.height == 1136;
}
var isPhone6: Bool {
return self.nativeBounds.size.height == 1334;
}
var isPhone6Plus: Bool {
return self.nativeBounds.size.height == 2208;
}
}
(注意:nativeBounds
以像素为单位)。
然后代码将如下所示:
if UIScreen.mainScreen().isPhone4 {
// do smth on the smallest screen
}