我想检查设备的iOS版本是否大于3.1.3 我尝试了以下方法:
[[UIDevice currentDevice].systemVersion floatValue]
但是不管用,我只想要一个:
if (version > 3.1.3) { }
我怎样才能做到这一点呢?
我想检查设备的iOS版本是否大于3.1.3 我尝试了以下方法:
[[UIDevice currentDevice].systemVersion floatValue]
但是不管用,我只想要一个:
if (version > 3.1.3) { }
我怎样才能做到这一点呢?
当前回答
我的解决方案是向您的实用程序类(提示提示)添加一个实用程序方法来解析系统版本并手动补偿浮点数排序。
此外,这段代码相当简单,所以我希望它能帮助一些新手。简单地传入一个目标浮点数,然后返回BOOL类型。
在你的共享类中这样声明它:
(+) (BOOL) iOSMeetsOrExceedsVersion:(float)targetVersion;
这样叫它:
BOOL shouldBranch = [SharedClass iOSMeetsOrExceedsVersion:5.0101];
(+) (BOOL) iOSMeetsOrExceedsVersion:(float)targetVersion {
/*
Note: the incoming targetVersion should use 2 digits for each subVersion --
example 5.01 for v5.1, 5.11 for v5.11 (aka subversions above 9), 5.0101 for v5.1.1, etc.
*/
// Logic: as a string, system version may have more than 2 segments (example: 5.1.1)
// so, a direct conversion to a float may return an invalid number
// instead, parse each part directly
NSArray *sysVersion = [[UIDevice currentDevice].systemVersion componentsSeparatedByString:@"."];
float floatVersion = [[sysVersion objectAtIndex:0] floatValue];
if (sysVersion.count > 1) {
NSString* subVersion = [sysVersion objectAtIndex:1];
if (subVersion.length == 1)
floatVersion += ([[sysVersion objectAtIndex:1] floatValue] *0.01);
else
floatVersion += ([[sysVersion objectAtIndex:1] floatValue] *0.10);
}
if (sysVersion.count > 2) {
NSString* subVersion = [sysVersion objectAtIndex:2];
if (subVersion.length == 1)
floatVersion += ([[sysVersion objectAtIndex:2] floatValue] *0.0001);
else
floatVersion += ([[sysVersion objectAtIndex:2] floatValue] *0.0010);
}
if (floatVersion >= targetVersion)
return TRUE;
// else
return FALSE;
}
其他回答
/*
* 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")) {
...
}
使用推荐的方法…如果头文件中没有定义,你总是可以在控制台上用所需的IOS设备versión打印versión。
- (BOOL) isIOS8OrAbove{
float version802 = 1140.109985;
float version8= 1139.100000; // there is no def like NSFoundationVersionNumber_iOS_7_1 for ios 8 yet?
NSLog(@"la version actual es [%f]", NSFoundationVersionNumber);
if (NSFoundationVersionNumber >= version8){
return true;
}
return false;
}
有7.0或6.0.3这样的版本,所以我们可以简单地将版本转换为数字进行比较。如果版本类似于7.0,只需追加另一个”。0”,然后取它的数值。
int version;
NSString* iosVersion=[[UIDevice currentDevice] systemVersion];
NSArray* components=[iosVersion componentsSeparatedByString:@"."];
if ([components count]==2) {
iosVersion=[NSString stringWithFormat:@"%@.0",iosVersion];
}
iosVersion=[iosVersion stringByReplacingOccurrencesOfString:@"." withString:@""];
version=[iosVersion integerValue];
为0
if (version==600) {
// Do something
}
为7.0
if (version==700) {
// Do something
}
试试这个
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
// do some work
}
我总是把它们保存在Constants.h文件中:
#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)