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
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
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nv-ios-version项目(Apache License, Version 2.0)中包含的Version类,很容易获取和比较iOS版本。下面的示例代码转储iOS版本,并检查版本是否大于或等于6.0。
// Get the system version of iOS at runtime.
NSString *versionString = [[UIDevice currentDevice] systemVersion];
// Convert the version string to a Version instance.
Version *version = [Version versionWithString:versionString];
// Dump the major, minor and micro version numbers.
NSLog(@"version = [%d, %d, %d]",
version.major, version.minor, version.micro);
// Check whether the version is greater than or equal to 6.0.
if ([version isGreaterThanOrEqualToMajor:6 minor:0])
{
// The iOS version is greater than or equal to 6.0.
}
// Another way to check whether iOS version is
// greater than or equal to 6.0.
if (6 <= version.major)
{
// The iOS version is greater than or equal to 6.0.
}
项目页面:nv-ios-version TakahikoKawasaki / nv-ios-version
博客:获取并比较iOS版本在运行时与版本类 获取并比较iOS版本在运行时与版本类
快速的例子,实际工作:
switch UIDevice.currentDevice().systemVersion.compare("8.0.0", options: NSStringCompareOptions.NumericSearch) {
case .OrderedSame, .OrderedDescending:
println("iOS >= 8.0")
case .OrderedAscending:
println("iOS < 8.0")
}
不要使用NSProcessInfo,因为它在8.0下不能工作,所以它在2016年之前几乎没用
#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
然后添加if条件,如下所示:-
if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"10.0")) {
//Your code
}
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