IOS不同版本的判断

系统版本的判断

 /*
 
 
 
  
System Versioning Preprocessor Macros
 */
 
 
 
 
define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame)
 
 
define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending)
 
 
define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
 
 
define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending)
 
 
define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending)
 
 
/*
 
 
 
  
Usage
 */
 
 
 
 
if (SYSTEM_VERSION_LESS_THAN(@"4.0")) {
 ...
 }
 
 
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"3.1.1")) {
 ...
 }
 
 
或者
 
 
define IS_IPHONE5 (([[UIScreen mainScreen] bounds].size.height-568)?NO:YES)
 
 
define IS_OS_5_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 5.0)
 
 
define IS_OS_6_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 6.0)
 
 
define IS_OS_7_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0)
 
 
define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
 
 

APP版本的判断

 
 
 
  
(NSString *) appVersion
 {
 return [[NSBundle mainBundle] objectForInfoDictionaryKey: @"CFBundleShortVersionString"];
 }
 

build版本判断

 
 
 
  
(NSString *) build
 {
 return [[NSBundle mainBundle] objectForInfoDictionaryKey: (NSString *)kCFBundleVersionKey];
 }
 

参考链接：
How to check iOS version?

Best Way to check for iOS 7 or earlier?