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
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
其他回答
一般来说,最好是询问一个对象是否可以执行给定的选择器,而不是检查版本号来决定它是否必须存在。
当这不是一个选项,你需要在这里有点小心,因为[@"5.0"比较:@"5"选项:NSNumericSearch]返回nsordereddescent这可能不是有意的;我可能期待NSOrderedSame。这至少是一个理论上的问题,在我看来,这是一个值得防范的问题。
同样值得考虑的是,可能会出现无法合理比较的糟糕版本输入。苹果提供了三个预定义的常量NSOrderedAscending, NSOrderedSame和nsordereddescent,但我可以想到一个叫做NSOrderedUnordered的东西的使用,在我不能比较两个东西的情况下,我想返回一个值来指示这个。
更重要的是,苹果有一天会扩展他们的三个预定义常量以允许各种返回值,这是不可能的,这使得比较不明智。
考虑下面的代码。
typedef enum {kSKOrderedNotOrdered = -2, kSKOrderedAscending = -1, kSKOrderedSame = 0, kSKOrderedDescending = 1} SKComparisonResult;
@interface SKComparator : NSObject
+ (SKComparisonResult)comparePointSeparatedVersionNumber:(NSString *)vOne withPointSeparatedVersionNumber:(NSString *)vTwo;
@end
@implementation SKComparator
+ (SKComparisonResult)comparePointSeparatedVersionNumber:(NSString *)vOne withPointSeparatedVersionNumber:(NSString *)vTwo {
if (!vOne || !vTwo || [vOne length] < 1 || [vTwo length] < 1 || [vOne rangeOfString:@".."].location != NSNotFound ||
[vTwo rangeOfString:@".."].location != NSNotFound) {
return SKOrderedNotOrdered;
}
NSCharacterSet *numericalCharSet = [NSCharacterSet characterSetWithCharactersInString:@".0123456789"];
NSString *vOneTrimmed = [vOne stringByTrimmingCharactersInSet:numericalCharSet];
NSString *vTwoTrimmed = [vTwo stringByTrimmingCharactersInSet:numericalCharSet];
if ([vOneTrimmed length] > 0 || [vTwoTrimmed length] > 0) {
return SKOrderedNotOrdered;
}
NSArray *vOneArray = [vOne componentsSeparatedByString:@"."];
NSArray *vTwoArray = [vTwo componentsSeparatedByString:@"."];
for (NSUInteger i = 0; i < MIN([vOneArray count], [vTwoArray count]); i++) {
NSInteger vOneInt = [[vOneArray objectAtIndex:i] intValue];
NSInteger vTwoInt = [[vTwoArray objectAtIndex:i] intValue];
if (vOneInt > vTwoInt) {
return kSKOrderedDescending;
} else if (vOneInt < vTwoInt) {
return kSKOrderedAscending;
}
}
if ([vOneArray count] > [vTwoArray count]) {
for (NSUInteger i = [vTwoArray count]; i < [vOneArray count]; i++) {
if ([[vOneArray objectAtIndex:i] intValue] > 0) {
return kSKOrderedDescending;
}
}
} else if ([vOneArray count] < [vTwoArray count]) {
for (NSUInteger i = [vOneArray count]; i < [vTwoArray count]; i++) {
if ([[vTwoArray objectAtIndex:i] intValue] > 0) {
return kSKOrderedAscending;
}
}
}
return kSKOrderedSame;
}
@end
以下是一个简短的版本:
struct iOSVersion {
static let SYS_VERSION_FLOAT = (UIDevice.currentDevice().systemVersion as NSString).floatValue
static let iOS7 = (Version.SYS_VERSION_FLOAT < 8.0 && Version.SYS_VERSION_FLOAT >= 7.0)
static let iOS8 = (Version.SYS_VERSION_FLOAT >= 8.0 && Version.SYS_VERSION_FLOAT < 9.0)
static let iOS9 = (Version.SYS_VERSION_FLOAT >= 9.0 && Version.SYS_VERSION_FLOAT < 10.0)
}
用法:
if iOSVersion.iOS8 {
//Do iOS8 code here
}
+(BOOL)doesSystemVersionMeetRequirement:(NSString *)minRequirement{
// eg NSString *reqSysVer = @"4.0";
NSString *currSysVer = [[UIDevice currentDevice] systemVersion];
if ([currSysVer compare:minRequirement options:NSNumericSearch] != NSOrderedAscending)
{
return YES;
}else{
return NO;
}
}
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
这是一个Swift版本的yasirmturk宏。希望它能帮助一些人
// MARK: System versionning
func SYSTEM_VERSION_EQUAL_TO(v: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare(v, options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedSame
}
func SYSTEM_VERSION_GREATER_THAN(v: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare(v, options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedDescending
}
func SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare(v, options: NSStringCompareOptions.NumericSearch) != NSComparisonResult.OrderedAscending
}
func SYSTEM_VERSION_LESS_THAN(v: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare(v, options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedAscending
}
func SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v: String) -> Bool {
return UIDevice.currentDevice().systemVersion.compare(v, options: NSStringCompareOptions.NumericSearch) != NSComparisonResult.OrderedDescending
}
let kIsIOS7: Bool = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO("7")
let kIsIOS7_1: Bool = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO("7.1")
let kIsIOS8: Bool = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO("8")
let kIsIOS9: Bool = SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO("9")