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字串比對大小(版本號比較)

介紹一個簡單的APP版本號比較方法

NSString *oldVersion = @"1.2.1";
NSString *newVersion = @"1.2.2";

if ([oldVersion compare:newVersion options:NSNumericSearch] ==NSOrderedDescending) {
    NSLog(@"%@ is bigger",oldVersion);
}else
{
    NSLog(@"%@ is bigger",newVersion);
}

//NSOrderedAscending 升序
//NSOrderedSame 相等
//NSOrderedDescending 降序