+ (NSString*)deviceString
{
// 需要#import "sys/utsname.h"
struct utsname systemInfo;
uname(&systemInfo);
NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];
if ([deviceString isEqualToString:@"iPhone8,4"]) return @"iPhone SE";
if ([deviceString isEqualToString:@"iPhone9,1"]) return @"iPhone 7";
if ([deviceString isEqualToString:@"iPhone9,2"]) return @"iPhone 7 Plus";
if ([deviceString isEqualToString:@"iPhone7,1"]) {return @"iPhone6Plus";}
if ([deviceString isEqualToString:@"iPhone8,2"]) {return @"iPhone6sPlus";}
if ([deviceString isEqualToString:@"iPhone8,1"]) {return @"iPhone6s";}
if ([deviceString isEqualToString:@"iPhone7,2"]) {return @"iPhone6";}
if ([deviceString isEqualToString:@"iPhone5,1"]||[deviceString isEqualToString:@"iPhone5,2"]) return @"iPhone 5";
if ([deviceString isEqualToString:@"iPhone6,2"]||[deviceString isEqualToString:@"iPhone6,1"]) return @"iPhone 5S";
if ([deviceString isEqualToString:@"iPhone6,2"]||[deviceString isEqualToString:@"iPhone6,1"]) return @"iPhone 5SE";
if ([deviceString isEqualToString:@"iPhone5,3"]||[deviceString isEqualToString:@"iPhone5,4"]) return @"iPhone 5C";
if ([deviceString isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
if ([deviceString isEqualToString:@"iPhone3,1"]||[deviceString isEqualToString:@"iPhone3,2"]||[deviceString isEqualToString:@"iPhone3,3"]) return @"iPhone 4";
if ([deviceString isEqualToString:@"iPhone3,2"]) return @"Verizon iPhone 4";
if ([deviceString isEqualToString:@"iPad1,1"]) return @"iPad";
if ([deviceString isEqualToString:@"iPad2,1"]) return @"iPad 2 (WiFi)";
if ([deviceString isEqualToString:@"iPad2,2"]) return @"iPad 2 (GSM)";
if ([deviceString isEqualToString:@"iPad2,3"]) return @"iPad 2 (CDMA)";
return deviceString;
}