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
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")
其他回答
虽然有点晚了,但鉴于iOS 8.0的存在,这可能是相关的:
如果可以避免使用
[[UIDevice目前]系统版本]
相反,检查是否存在方法/类/其他任何东西。
if ([self.yourClassInstance respondsToSelector:@selector(<yourMethod>)])
{
//do stuff
}
我发现它对位置管理器很有用,我必须调用requestWhenInUseAuthorization for iOS 8.0,但该方法不适用于iOS < 8
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
试试这个
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {
// do some work
}
Try:
NSComparisonResult order = [[UIDevice currentDevice].systemVersion compare: @"3.1.3" options: NSNumericSearch];
if (order == NSOrderedSame || order == NSOrderedDescending) {
// OS version >= 3.1.3
} else {
// OS version < 3.1.3
}