4，4s屏幕过渡页处理

    //#import "sys/utsname.h"

    struct utsname systemInfo;

    uname(&systemInfo);

    NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];

    NSLog(@"%@, %@", deviceString, NSStringFromCGSize(self.view.bounds.size));

    imv = [[UIImageView alloc] initWithFrame:self.view.frame];

    NSRange ran = [deviceString rangeOfString:@"iPhone4"];

    NSRange ran1 = [deviceString rangeOfString:@"x86"];

    if(ran.location != NSNotFound || ran1.location != NSNotFound){

        imv.image = [UIImage imageNamed:@"ios640.png"];

    }else{

        imv.image = [UIImage imageNamed:@"wait"];

    }

    [self.view addSubview:imv];