读取本地文件，获取string 或者 data

NSString *path = [[NSBundle mainBundle] pathForResource:@"xxx" ofType:@"xxx"];
NSError *error = nil;
NSString *content = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:&error];

NSData * data = [NSData dataWithContentsOfFile: path];

iOS中字符串的用法

iOS 关于textFeild 和 键盘的设置

关于delegate

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