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
UIDevice + IOSVersion.h
@interface UIDevice (IOSVersion)
+ (BOOL)isCurrentIOSVersionEqualToVersion:(NSString *)iOSVersion;
+ (BOOL)isCurrentIOSVersionGreaterThanVersion:(NSString *)iOSVersion;
+ (BOOL)isCurrentIOSVersionGreaterThanOrEqualToVersion:(NSString *)iOSVersion;
+ (BOOL)isCurrentIOSVersionLessThanVersion:(NSString *)iOSVersion;
+ (BOOL)isCurrentIOSVersionLessThanOrEqualToVersion:(NSString *)iOSVersion
@end
UIDevice + IOSVersion.m
#import "UIDevice+IOSVersion.h"
@implementation UIDevice (IOSVersion)
+ (BOOL)isCurrentIOSVersionEqualToVersion:(NSString *)iOSVersion
{
return [[[UIDevice currentDevice] systemVersion] compare:iOSVersion options:NSNumericSearch] == NSOrderedSame;
}
+ (BOOL)isCurrentIOSVersionGreaterThanVersion:(NSString *)iOSVersion
{
return [[[UIDevice currentDevice] systemVersion] compare:iOSVersion options:NSNumericSearch] == NSOrderedDescending;
}
+ (BOOL)isCurrentIOSVersionGreaterThanOrEqualToVersion:(NSString *)iOSVersion
{
return [[[UIDevice currentDevice] systemVersion] compare:iOSVersion options:NSNumericSearch] != NSOrderedAscending;
}
+ (BOOL)isCurrentIOSVersionLessThanVersion:(NSString *)iOSVersion
{
return [[[UIDevice currentDevice] systemVersion] compare:iOSVersion options:NSNumericSearch] == NSOrderedAscending;
}
+ (BOOL)isCurrentIOSVersionLessThanOrEqualToVersion:(NSString *)iOSVersion
{
return [[[UIDevice currentDevice] systemVersion] compare:iOSVersion options:NSNumericSearch] != NSOrderedDescending;
}
@end
作为yasimturks解决方案的一种变体,我定义了一个函数和一些枚举值,而不是五个宏。我觉得它更优雅,但那是个人品味的问题。
用法:
if (systemVersion(LessThan, @"5.0")) ...
. h文件:
typedef enum {
LessThan,
LessOrEqual,
Equal,
GreaterOrEqual,
GreaterThan,
NotEqual
} Comparison;
BOOL systemVersion(Comparison test, NSString* version);
m文件:
BOOL systemVersion(Comparison test, NSString* version) {
NSComparisonResult result = [[[UIDevice currentDevice] systemVersion] compare: version options: NSNumericSearch];
switch (test) {
case LessThan: return result == NSOrderedAscending;
case LessOrEqual: return result != NSOrderedDescending;
case Equal: return result == NSOrderedSame;
case GreaterOrEqual: return result != NSOrderedAscending;
case GreaterThan: return result == NSOrderedDescending;
case NotEqual: return result != NSOrderedSame;
}
}
你应该在名称中添加应用程序的前缀,尤其是比较类型。
float deviceOSVersion = [[[UIDevice currentDevice] systemVersion] floatValue];
float versionToBeCompared = 3.1.3; //(For Example in your case)
if(deviceOSVersion < versionToBeCompared)
//Do whatever you need to do. Device version is lesser than 3.1.3(in your case)
else
//Device version should be either equal to the version you specified or above
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;
}
/*
* 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")) {
...
}