1.获得屏幕的宽高
[UIScreen mainScreen].bounds.size.width
[UIScreen mainScreen].bounds.size.height
2.Iphone版本判别：
iPhone5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640,1136), [[UIScreen mainScreen] currentMode].size) : NO)
iPhone4 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640,960), [[UIScreen mainScreen] currentMode].size) : NO)
Phone6 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(750,1334), [[UIScreen mainScreen] currentMode].size) : NO)
iPhone6plus ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1242,2208), [[UIScreen mainScreen] currentMode].size) : NO)
3.Iphone、Ipad、Ipod判别：
[UIDevice currentDevice].model
4.获得Documents路径：
NSArray *array = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *path = [array lastObject];
5.获得mp路径：
NSString *tmp = NSTemporaryDirectory();