ios 判断系统版本，及Interger打印格式

来源：互联网发布：淘宝如何代理虚拟编辑：程序博客网时间：2024/06/05 08:48

refs：

http://stackoverflow.com/questions/23818606/semantic-issue-implicit-declaration-of-function

http://stackoverflow.com/questions/4405006/nslog-printf-specifier-for-nsinteger

1）ios 判断系统版本，分别处理

Add these lines from your link to your .pch file. Clean and build. It should go away.

#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)

使用

 if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0") && SYSTEM_VERSION_LESS_THAN(@"7.1")) {       xxxx;    }

2）Interger NSLog打印报警，之前项目是32位，后来升级为64位导致的。

 NSLog(@"%d", i);

改位

 NSLog(@"%ld", i);

With current Xcode, you can make use of the z and t modifiers to handleNSInteger andNSUInteger without warnings, on all architectures.

You want to use %zd for signed, %tu for unsigned, and%tx for hex.

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