一、前言
今天做一个功能，需要动态的获得启动页，然后根据不同设备去使用不用的启动页图片。
二、正文
常规来说，我们直接判断是何种设备，然后通过name去获得图片选择性加载即可。但是实际上遇到的两个问题。
第一：如何判断各种设备。
第二：怎么去拿到启动页图片。
先看第一个问题，怎么去判断各种设备。原来习惯性的是直接判断设备高度。闲着没事就通过
[UIScreen mainScreen].bounds.size.height
这个方法去获得各种设备的高度，如下：
//iPhone4s 480//iPhone 5 568//iPhone 5s 568//iPhone 6 667//iPhone 6p 736//iPhone 6s 667//iPhone 6sp 736
因此做了一个判断方法一：
- (NSString *)getCurrentDeviceVersion { CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height; if (screenHeight==480) { // return nil; return @"iPhone4/iPhone4s"; }else if (screenHeight==568) { return @"iPhone5/iPhone5s/iPhone5c"; }else if (screenHeight==667) { return @"iPhone6/iPhone6s"; }else if (screenHeight==736) { return @"iPhone6 plus/iPhone6s plus"; }else { return @"another"; }}
其实这是一个很low的方法，只是根据高度去判断，不过这样也可以去判断。
下面来看看方法二：
首先，我们需要在使用的类里面导入：
#import <sys/utsname.h> - (NSString *)getDeviceVersion { struct utsname systemInfo; uname(&systemInfo); NSString *deviceName = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding]; if ([deviceName isEqualToString:@"iPhone3,1"] || [deviceName isEqualToString:@"iPhone3,3"]|| [deviceName isEqualToString:@"iPhone4,1"]) { //判断是否是iPhone4,iPhone4s return @"iPhone4/iPhone4s"; }else if ([deviceName isEqualToString:@"iPhone5,1"]|| [deviceName isEqualToString:@"iPhone5,2"]||[deviceName isEqualToString:@"iPhone5,3"] || [deviceName isEqualToString:@"iPhone5,4"] || [deviceName isEqualToString:@"iPhone6,1"] || [deviceName isEqualToString:@"iPhone6,2"]) { return @"iPhone5/iPhone5s/iPhone5c"; }else if ([deviceName isEqualToString:@"iPhone7,1"] || [deviceName isEqualToString:@"iPhone8,2"]) { return @"iPhone6 plus/iPhone6s plus"; }else if ([deviceName isEqualToString:@"iPhone7,2"] || [deviceName isEqualToString:@"iPhone8,1"]) { return @"iPhone6/iPhone6s"; }else { //真机上边不会走到 return @"another"; }}
方法二主要用到了一个类utsname.h。打开之后，我们可以发现他就是一个结构体：
struct utsname { char sysname[_SYS_NAMELEN]; /* [XSI] Name of OS */ char nodename[_SYS_NAMELEN]; /* [XSI] Name of this network node */ char release[_SYS_NAMELEN]; /* [XSI] Release level */ char version[_SYS_NAMELEN]; /* [XSI] Version level */ char machine[_SYS_NAMELEN]; /* [XSI] Hardware type */};
先来看看怎么去取到
struct utsname systemInfo; uname(&systemInfo); NSString *deviceName = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
当输出deviceName的时候，你就会发现不同的设备将会输出不同的内容，但是当我们使用模拟器的时候，会输出：
x86_64
其实这个是在64-bit Simulator下输出的。如果我们使用的是32-bit Simulator，那么输出的结果就是
i386
然后我使用iPhone5s进行测试，输出结果是：
iPhone6,2当时比较疑惑，这是什么情况呢？然后就google了一下。原来这个是设备的类型。而且不同的设备类型也不一样。然后就在这里发现了下面的内容：(其实这个结果就是设备类型)
//模拟器@"i386" on 32-bit Simulator@"x86_64" on 64-bit Simulator//iPod--可能不全面@"iPod1,1" on iPod Touch@"iPod2,1" on iPod Touch Second Generation@"iPod3,1" on iPod Touch Third Generation@"iPod4,1" on iPod Touch Fourth Generation@"iPod5,1" on iPod Touch 5th Generation@"iPod7,1" on iPod Touch 6th Generation//iPhone --全面了@"iPhone1,1" on iPhone@"iPhone1,2" on iPhone 3G@"iPhone2,1" on iPhone 3GS@"iPhone3,1" on iPhone 4 (GSM)@"iPhone3,2" on iPhone 4@"iPhone3,3" on iPhone 4 (CDMA/Verizon/Sprint)@"iPhone4,1" on iPhone 4S@"iPhone5,1" on iPhone 5 (model A1428, AT&T/Canada)@"iPhone5,2" on iPhone 5 (model A1429, everything else)@"iPhone5,3" on iPhone 5c (model A1456, A1532 | GSM)@"iPhone5,4" on iPhone 5c (model A1507, A1516, A1526 (China), A1529 | Global)@"iPhone6,1" on iPhone 5s (model A1433, A1533 | GSM)@"iPhone6,2" on iPhone 5s (model A1457, A1518, A1528 (China), A1530 | Global)@"iPhone7,1" on iPhone 6 Plus@"iPhone7,2" on iPhone 6@"iPhone8,1" on iPhone 6S@"iPhone8,2" on iPhone 6S Plus//iPad --不全面@"iPad1,1" on iPad@"iPad2,1" on iPad 2@"iPad3,1" on 3rd Generation iPad@"iPad3,4" on 4th Generation iPad@"iPad2,5" on iPad Mini@"iPad4,1" on 5th Generation iPad (iPad Air) - Wifi@"iPad4,2" on 5th Generation iPad (iPad Air) - Cellular@"iPad4,4" on 2nd Generation iPad Mini - Wifi@"iPad4,5" on 2nd Generation iPad Mini - Cellular@"iPad4,7" on 3rd Generation iPad Mini - Wifi (model A1599)
这里几乎包括了所有的iOS移动设备。
然后就根据这个去判断了一下
- (NSString *)getDeviceModel { struct utsname systemInfo; uname(&systemInfo); NSString *deviceName = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding]; if ([deviceName isEqualToString:@"iPhone3,1"] || [deviceName isEqualToString:@"iPhone3,3"]|| [deviceName isEqualToString:@"iPhone4,1"]) { //判断是否是iPhone4,iPhone4s return @"iPhone4/iPhone4s"; }else if ([deviceName isEqualToString:@"iPhone5,1"]|| [deviceName isEqualToString:@"iPhone5,2"]||[deviceName isEqualToString:@"iPhone5,3"] || [deviceName isEqualToString:@"iPhone5,4"] || [deviceName isEqualToString:@"iPhone6,1"] || [deviceName isEqualToString:@"iPhone6,2"]) { return @"iPhone5/iPhone5s/iPhone5c"; }else if ([deviceName isEqualToString:@"iPhone7,1"] || [deviceName isEqualToString:@"iPhone8,2"]) { return @"iPhone6 plus/iPhone6s plus"; }else if ([deviceName isEqualToString:@"iPhone7,2"] || [deviceName isEqualToString:@"iPhone8,1"]) { return @"iPhone6/iPhone6s"; }else { //真机上边不会走到 return @"another"; }}
这样就得到了不同版本的设备。有兴趣的话还可以点这里（可能需要越狱）
这样，第一个问题就结局了。第二个问题是如何获得当前project的启动页面。（不要妄想去通过名字拿，试了，拿不到。）
后来google了一下：得到如下
//iPhone4/4s:[UIImage imageNamed: @"LaunchImage-700"];////iPhone5/5s/5c： [UIImage imageNamed: @"LaunchImage-700-568h"];////iPhone6： [UIImage imageNamed: @"LaunchImage-800-667h"];////iPhone6 plus 竖屏：[UIImage imageNamed: @"LaunchImage-800-Portrait-736h"];////iPhone6 plus 横屏：[UIImage imageNamed: @"LaunchImage-800-Portrait-736h"];
意思就是当你是iPhone4/4s的时候，就通过
[UIImage imageNamed: @"LaunchImage-700"];
来拿到启动页面。其他的一样。
这样就拿到了启动页面。
综合起来解决前言问题的方法就是：
//方法一- (UIImage *)getLaunchImage { CGFloat screenHeight = [UIScreen mainScreen].bounds.size.height; if (screenHeight==480) {// return nil; return [UIImage imageNamed: @"LaunchImage-700"]; }else if (screenHeight==568) { return [UIImage imageNamed: @"LaunchImage-700-568h"]; }else if (screenHeight==667) { return [UIImage imageNamed: @"LaunchImage-800-667h"]; }else if (screenHeight==736) { return [UIImage imageNamed: @"LaunchImage-800-Portrait-736h"]; }else { return [UIImage imageNamed:@"placeH"]; }}/** * 通过系统信息得到版本 *方法二 * @return 指定的LaunchImage */- (UIImage *)getLaunchImageByiPhoneType { struct utsname systemInfo; uname(&systemInfo); NSString *deviceName = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding]; if ([deviceName isEqualToString:@"iPhone3,1"] || [deviceName isEqualToString:@"3,2"] ||[deviceName isEqualToString:@"iPhone3,3"]|| [deviceName isEqualToString:@"iPhone4,1"]) { //判断是否是iPhone4,iPhone4s return [UIImage imageNamed:@"LaunchImage-700"]; }else if ([deviceName isEqualToString:@"iPhone5,1"]|| [deviceName isEqualToString:@"iPhone5,2"]||[deviceName isEqualToString:@"iPhone5,3"] || [deviceName isEqualToString:@"iPhone5,4"] || [deviceName isEqualToString:@"iPhone6,1"] || [deviceName isEqualToString:@"iPhone6,2"]) { return [UIImage imageNamed: @"LaunchImage-700-568h"]; }else if ([deviceName isEqualToString:@"iPhone7,1"] || [deviceName isEqualToString:@"iPhone8,2"]) { return [UIImage imageNamed: @"LaunchImage-800-Portrait-736h"]; }else if ([deviceName isEqualToString:@"iPhone7,2"] || [deviceName isEqualToString:@"iPhone8,1"]) { return [UIImage imageNamed: @"LaunchImage-800-667h"]; }else { //真机上边不会走到 return [UIImage imageNamed:@"placeH"]; //这里我用了一张默认图片 }}
三、结语
如果大家有什么疑问或者我说的不对的地方尽管提出来。