ios - 比较两个版本号

Question

如何比较两个版本号字符串？

例如：3.1.1 和 3.1.2.5.4

现在我需要确定 3.1.2.5.4 是否高于 3.1.1 但我不知道该怎么做。有谁能够帮我？

提前致谢！

Answer 1

示例代码：

NSString* v1 = @"3.1.1";
NSString* v2 = @"3.1.2.5.4";

if ([v1 compare:v2 options:NSNumericSearch] == NSOrderedDescending) {
    NSLog(@"%@ is greater than %@",v1,v2);
}

来自用于比较和排序字符串的 Apple 文档。

Answer 2

是的，您可以比较版本，请参考以下代码：

public class Comparision {

    string ver1, ver2;
    public static void main(String args[]){
    string ver1Split[] = ver1.split('.');
    string ver2Split[] = ver2.split('.');

    for (int i = 0; i < ver1Split.length; ++i) {
        if (ver2Split == i) {
            return ver1 + " is larger";
        }

        if (ver1Split[i] == ver2Split[i]) {
            continue;
        }
        else if (ver1Split[i] > ver1Split[i]) {
            return ver1 + " is larger";
        }
        else {
            return ver2 + " is larger";
        }
        if (ver1Split.length != ver2Split.length) {
            return ver2 + " is larger";
        }
        return "versions are equal";
    }
}

Answer 3

目标-C：

- (BOOL)isVersion:(NSString *)arg1 higherThan:(NSString *)arg2 {

    NSMutableString * v1 = arg1.mutableCopy;
    NSMutableString * v2 = arg2.mutableCopy;

    NSMutableArray * parts1 = [v1 componentsSeparatedByString:@"."].mutableCopy;
    NSMutableArray * parts2 = [v2 componentsSeparatedByString:@"."].mutableCopy;

    if (parts1.count > parts2.count) {

        NSInteger diff = parts1.count - parts2.count;

        for (NSInteger i = diff; i<parts1.count; i++) {
            [v2 appendString:@".0"];
        }

    } else if (parts1.count < parts2.count){

        NSInteger diff = parts2.count - parts1.count;

        for (NSInteger i = diff; i<parts2.count; i++) {
            [v1 appendString:@".0"];
        }

    }

    parts1 = [v1 componentsSeparatedByString:@"."].mutableCopy;
    parts2 = [v2 componentsSeparatedByString:@"."].mutableCopy;

    NSInteger j = 0;
    for (NSString * num1 in parts1) {
        NSString * num2 = parts2[j];
        if(num1.integerValue > num2.integerValue){
            //break;
            return YES;
        } else if (num1.integerValue < num2.integerValue) {
            //break;
            return NO;
        } else {
            // ==
        }
        j++;
    }

    return NO;
}

单元测试：

- (void)test_isHigherFunc {

    XCTAssert([self isVersion:@"4.1.2.1" higherThan:@"4.1.2.0"]);

    XCTAssertFalse([self isVersion:@"4.1.2.0" higherThan:@"4.1.2.0"]);

    XCTAssert([self isVersion:@"4.1.2.0" higherThan:@"4.1.1.0"]);

    XCTAssertFalse([self isVersion:@"3.1.2.0" higherThan:@"4.1.1.0"]);

    XCTAssertFalse([self isVersion:@"4.2.2.0" higherThan:@"4.3.1.0"]);

    XCTAssert([self isVersion:@"5.2" higherThan:@"4.3.1.0"]);

    XCTAssertFalse([self isVersion:@"6.2" higherThan:@"7.3.1.0"]);

    XCTAssert([self isVersion:@"6.2" higherThan:@"5"]);

    XCTAssert([self isVersion:@"6.2.0" higherThan:@"5.9"]);

    XCTAssert([self isVersion:@"1.1.1.1.1.1.1.1" higherThan:@"1.1.1.1.1.1.1.0"]);

    XCTAssert([self isVersion:@"2.0" higherThan:@"1"]);
}