Question

我是一位不了解目标c的敏捷开发人员。谁能帮我转换一下Objective C中的以下代码

let newVersion = Int((userInfo.value(forKey: 
"gcm.notification.version") as string).replacingOccurrences(of: ".", with: ""))
let currentVersion = Int((userDefaults.standard.value(forKey: "currentAppVersion") as string).replacingOccurrences(of: ".", with: ""))



if(newVersion > currentVersion) {
//code here
}

Answer 1

    NSString *newVersion = [(NSString *)[notification.userInfo valueForKey:@"gcm.notification.version"] stringByReplacingOccurrencesOfString:@"." withString:@""];
    NSUserDefaults *standardDefaults = [NSUserDefaults standardUserDefaults];
    NSString *oldVersion = [(NSString *)[standardDefaults valueForKey:@"currentAppVersion"] stringByReplacingOccurrencesOfString:@"." withString:@""];

    if ([newVersion integerValue] > [oldVersion integerValue]){
        //code here
    }

Answer 2

应该执行以下操作：

NSDictionary *userInfo; // Assuming this is a dictionary
NSString *newVersionString = userInfo[@"gcm.notification.version"];
newVersionString = [newVersionString stringByReplacingOccurrencesOfString:@"." withString:@""];
NSInteger newVersion = [[[NSDecimalNumber alloc] initWithString:newVersionString] integerValue];

NSString *currentVersionString = [[NSUserDefaults standardUserDefaults] valueForKey:@"currentAppVersion"];
currentVersionString = [currentVersionString stringByReplacingOccurrencesOfString:@"." withString:@""];
NSInteger currentVersion = [[[NSDecimalNumber alloc] initWithString:currentVersionString] integerValue];

if(newVersion > currentVersion) {
    //code here
}

但这不是您比较版本的方式。现在的问题是，例如1.11.1等于11.1.1。或者换句话说，无论如何您都可以重新定位点，但是如果数字的数量和它们的顺序保持不变，那么您会将其检测为相同的版本。您应该针对每个组件（在Swift或Objective-C中）执行此操作：

NSDictionary *userInfo;
NSArray<NSString *> *newComponents = [userInfo[@"gcm.notification.version"] componentsSeparatedByString:@"."];

NSString *currentVersionString = [[NSUserDefaults standardUserDefaults] valueForKey:@"currentAppVersion"];
NSArray<NSString *> *currentComponents = [currentVersionString componentsSeparatedByString:@"."];

BOOL newVersionIsGreater = NO;
if(newComponents.count != currentComponents.count) newVersionIsGreater = newComponents.count > currentComponents.count;
else {
    for(int i=0; i<newComponents.count; i++) {
        NSInteger newInteger = [[[NSDecimalNumber alloc] initWithString:newComponents[i]] integerValue];
        NSInteger currentInteger = [[[NSDecimalNumber alloc] initWithString:currentComponents[i]] integerValue];
        if(newInteger != currentInteger) {
            newVersionIsGreater = newInteger > currentInteger;
            break;
        }
    }
}

if(newVersionIsGreater) {
    //code here
}

现在，这将检查两种情况下我们是否具有相同数量的组件，然后进行遍历。第一个不同的组件将报告更改。

如何在目标c中强制转换和转换数据类型

2 个答案: