有小夥伴問了一個問題，plist寫入失敗的問題。下面我說下相關的程式碼：

1.寫入plist（程式碼建立的plist檔案）此方法是不斷寫入，不會替換之前資料

- (void)insertToPlist:(NSDictionary *)dictionary nickName:(NSString *)nickName {

NSString *plistPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject] stringByAppendingPathComponent

NSMutableDictionary *userDict = [[NSMutableDictionaryalloc] initWithContentsOfFile:plistPath];

//下邊if判斷很重要，不然會寫入失敗.

if (!userDict) {

        userDict = [[NSMutableDictionaryalloc] init];

    }

//設定屬性值

    [userDict setObject:dictionary forKey:nickName];

//寫入檔案

    [userDict

}

注意：如果想每次都替換資料，把上邊的[[NSMutableDictionaryalloc] initWithContentsOfFile:plistPath]改成：[[NSMutableDictionaryalloc] init]，if語句三行程式碼去掉即可

2.讀取plist（程式碼建立的plist檔案）

- (void)getPlistDictionary:(NSString *)nickName

{

NSString *plistPath = [[NSSearchPathForDirectoriesInDomains

NSMutableDictionary *userDict = [[NSMutableDictionaryalloc ]initWithContentsOfFile:plistPath];

    //userDict[nickName]就是上邊方法存入的字典,取出來就可以進行相應的賦值操作啦

}