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Objective-c把字符解析成字典

ai 2025/7/1 7:51:49

解析JSON字符串为字典

在Objective-C中，将JSON字符串解析为字典可以使用NSJSONSerialization类。该方法适用于标准的JSON格式字符串。

NSString *jsonString = @"{\"name\":\"John\", \"age\":30}";
NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];NSError *error;
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:kNilOptions error:&error];if (error) {NSLog(@"解析失败: %@", error.localizedDescription);
} else {NSLog(@"解析结果: %@", dictionary);
}

解析URL查询字符串为字典

对于URL查询字符串（如"key1=value1&key2=value2"），可以使用以下方法转换为字典：

NSString *queryString = @"name=John&age=30";
NSMutableDictionary *params = [NSMutableDictionary dictionary];NSArray *pairs = [queryString componentsSeparatedByString:@"&"];
for (NSString *pair in pairs) {NSArray *elements = [pair componentsSeparatedByString:@"="];if (elements.count == 2) {NSString *key = [elements[0] stringByRemovingPercentEncoding];NSString *value = [elements[1] stringByRemovingPercentEncoding];params[key] = value;}
}NSLog(@"解析结果: %@", params);

解析属性列表(plist)字符串为字典

对于属性列表格式的字符串，可以使用NSPropertyListSerialization：

NSString *plistString = @"<dict><key>name</key><string>John</string><key>age</key><integer>30</integer></dict>";
NSData *plistData = [plistString dataUsingEncoding:NSUTF8StringEncoding];NSError *error;
NSDictionary *dictionary = [NSPropertyListSerialization propertyListWithData:plistData options:NSPropertyListImmutable format:NULL error:&error];if (error) {NSLog(@"解析失败: %@", error.localizedDescription);
} else {NSLog(@"解析结果: %@", dictionary);
}

解析自定义格式字符串为字典

对于自定义格式的字符串，可能需要编写特定的解析逻辑：

NSString *customString = @"name:John,age:30,city:New York";
NSMutableDictionary *resultDict = [NSMutableDictionary dictionary];NSArray *components = [customString componentsSeparatedByString:@","];
for (NSString *component in components) {NSArray *keyValue = [component componentsSeparatedByString:@":"];if (keyValue.count == 2) {NSString *key = [keyValue[0] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];NSString *value = [keyValue[1] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];resultDict[key] = value;}
}NSLog(@"解析结果: %@", resultDict);