得到设备是何种iPhone设备 + 怎么获得启动页面图片

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。