加载字符串到 NSMutableDictionary 示例

本文介绍了一个游戏开发中的关卡时间和动画顶点数据的加载实现方式。通过读取配置文件来设置不同关卡的时长,并使用特定格式的文本文件来存储动画顶点信息。

// 加载每个关卡钟表走动的时间~

-(void) loadLevelDurationTime {

_levelDurationTimeData = [[NSMutableArray alloc] init];

int levelTotalCount = [_gCfg ifk:@"levelTotalCount"];

for(int i = 0; i < levelTotalCount; i ++) {

[_levelDurationTimeData addObject:@"10"]; // 每关默认10秒钟,如果配置文件中有做配置,则将默认覆盖掉~

}

NSString *absPath = [[NSBundle mainBundle] pathForResource:@"levelDuration" ofType:@"txt"];

NSFileManager *fm = [NSFileManager defaultManager];

if([fm fileExistsAtPath:absPath] == NO) {

NSLog(@"File not exists!");

return;

}

NSString *fileContent = [NSString stringWithContentsOfFile:absPath

encoding:NSUTF8StringEncoding

error:nil];

// NSLog(@"file contents:\n%@", fileContent);

NSArray *cfgTime = [fileContent componentsSeparatedByString:@"\n"];

int lessLength = MIN( [cfgTime count], [_levelDurationTimeData count] );

for(int i = 0; i < lessLength; i ++) {

[_levelDurationTimeData replaceObjectAtIndex:i withObject:[cfgTime objectAtIndex:i]];

// NSLog(@"%d关的等待时间长度为: %@", i, [_levelDurationTimeData objectAtIndex:i]);

}

}


// 加载sprite动画的顶点信息~

-(void) loadAnimationData {

_animVerticesDic = [[NSMutableDictionary alloc] initWithCapacity:20];

NSString *absPath = [[NSBundle mainBundle] pathForResource:@"animVerticesSummary" ofType:@"txt"];

NSFileManager *fm = [NSFileManager defaultManager];

if([fm fileExistsAtPath:absPath] == NO) {

NSLog(@"File not exists!");

return;

}

NSString *fileContent = [NSString stringWithContentsOfFile:absPathencoding:NSUTF8StringEncodingerror:nil];

NSArray *verticesSummaryArray = [fileContent componentsSeparatedByString:@"\n"];

int len = [verticesSummaryArray count];

for(int i = 0; i < len; i ++) {

NSString *unit = [verticesSummaryArray objectAtIndex:i];

NSRange range = [unit rangeOfString:@"="];

// NSLog(@"range.location=%d, range.length=%d", range.location, range.length);

NSString *keyStr = [unit substringToIndex:range.location];

// NSLog(@"keyString: %@", keyStr);

NSString *valueStr = [unit substringFromIndex:range.location+1];

// NSLog(@"valueString: %@", valueStr);

[_animVerticesDic setObject:valueStr forKey:keyStr];

}

}

iOS 中使用 RSA 加密和解密需要使用到公钥和私钥,其中公钥可以转换为字符串形式。具体步骤如下: 1. 导入 Security.framework 框架 2. 创建 SecKeyRef 对象 ```objc - (SecKeyRef)getPublicKey { NSString *publicKeyString = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDcNwJztMj+UyIeHJv6X9F6n/2/2jD6UxvTmJwY8C3q1zDfjTJbX9eW1aLlZa+RfCv5GJjW8VgJdMfR7Vv0X2O4tj3qJ4E4tVvzj+Kg8VQaQ2bPL7Jv5X5b5g5Z5hGp5x5YgldfM6Jy1e+HJGcE0WgDvJIDBj6UO2L0ZwY8D2Q0z0TJr+Iqz1W8lGcC9EwwIDAQAB"; NSData *data = [[NSData alloc] initWithBase64EncodedString:publicKeyString options:NSDataBase64DecodingIgnoreUnknownCharacters]; if (!data) { return nil; } NSString *tag = @"com.example.publickey"; NSMutableDictionary *attributes = [[NSMutableDictionary alloc] initWithObjectsAndKeys: (__bridge id)kSecClassKey, (__bridge id)kSecClass, (__bridge id)kSecAttrKeyTypeRSA, (__bridge id)kSecAttrKeyType, tag, (__bridge id)kSecAttrApplicationTag, (__bridge id)kSecAttrKeyClassPublic, (__bridge id)kSecAttrKeyClass, nil]; SecKeyRef keyRef = SecKeyCreateWithData((__bridge CFDataRef)data, (__bridge CFDictionaryRef)attributes, nil); return keyRef; } ``` 3. 将 SecKeyRef 对象转换为公钥字符串 ```objc - (NSString *)getPublicKeyString { SecKeyRef keyRef = [self getPublicKey]; if (!keyRef) { return nil; } NSData *data = [self dataFromKey:keyRef]; NSString *base64String = [data base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength]; return base64String; } - (NSData *)dataFromKey:(SecKeyRef)key { CFDataRef dataRef = SecKeyCopyExternalRepresentation(key, nil); if (!dataRef) { return nil; } NSData *data = (__bridge NSData *)dataRef; CFRelease(dataRef); return data; } ``` 以上代码将公钥字符串转换为 SecKeyRef 对象,然后再将 SecKeyRef 对象转换为 NSData 对象,最终使用 base64 编码将 NSData 对象转换为字符串形式。
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