后台存储的版本号1.0.4
当前的版本号 1.0.1
- (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask;
NSString *serverVersion = @"1.0.4"; // 后台存储的版本号 NSString *curVersion = @"1.0.1"; // 当前app的版本号 NSComparisonResult comResult = [serverVersion compare:curVersion options:NSNumericSearch]; if (comResult == NSOrderedDescending) { // serverVersion > curVersion // 提示app进行升级 } else if (comResult == NSOrderedAscending) { // serverVersion < curVersion } else if (comResult == NSOrderedSame) { // serverVersion = curVersion }枚举值:
options:(NSStringCompareOptions)
typedef NS_OPTIONS(NSUInteger, NSStringCompareOptions) {
NSCaseInsensitiveSearch = 1, /**/
NSLiteralSearch = 2, /* 按字符等价的精确字符, 区分大小写*/
NSBackwardsSearch = 4, /* Search from end of source string */
NSAnchoredSearch = 8, /* Search is limited to start (or end, if NSBackwardsSearch) of source string */
NSNumericSearch = 64, /*数字比较 Added in 10.2; Numbers within strings are compared using numeric value, that is, Foo2.txt < Foo7.txt < Foo25.txt; only applies to compare methods, not find */
NSDiacriticInsensitiveSearch API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0)) = 128, /* If specified, ignores diacritics (o-umlaut == o) */
NSWidthInsensitiveSearch API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0)) = 256, /* If specified, ignores width differences ('a' == UFF41) */
NSForcedOrderingSearch API_AVAILABLE(macos(10.5), ios(2.0), watchos(2.0), tvos(9.0)) = 512, /* If specified, comparisons are forced to return either NSOrderedAscending or NSOrderedDescending if the strings are equivalent but not strictly equal, for stability when sorting (e.g. "aaa" > "AAA" with NSCaseInsensitiveSearch specified) */
NSRegularExpressionSearch API_AVAILABLE(macos(10.7), ios(3.2), watchos(2.0), tvos(9.0)) = 1024 /* Applies to rangeOfString:..., stringByReplacingOccurrencesOfString:..., and replaceOccurrencesOfString:... methods only; the search string is treated as an ICU-compatible regular expression; if set, no other options can apply except NSCaseInsensitiveSearch and NSAnchoredSearch */
};
