如何将自定义NSObject复制到NSMutableArray

本文介绍了如何将自定义NSObject复制到NSMutableArray的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; NSArray* users = [json objectForKey:@"Users"]; NSEnumerator* enumerator = [users objectEnumerator]; id element; NSMutableArray *results; Result *fetchedResults; while(element = [enumerator nextObject]) { // fetchedResults = [[Result alloc] init]; // i have tried commenting/uncommenting fetchedResults.name = (NSString *)[[element objectForKey:@"User"] objectForKey:@"name"]; fetchedResults.email = (NSString *)[[element objectForKey:@"User"] objectForKey:@"name"]; NSLog(@"%@", fetchedResults.name); [results addObject:fetchedResults]; NSLog(@"%@", (NSString *)[[element objectForKey:@"User"] objectForKey:@"name"]); // this returns valid dump } NSLog(@"%d", [results count]); // returns 0

我不明白这里错了.我搜索了许多教程，并且资源似乎在这里没错.

I don't understand wht's wrong here. I have searched through numerous tutorials and resources don't seem to get what's wrong here.

NSLog(@"%@", fetchedResults.name); // dumps null

推荐答案

您忘记分配结果数组NSMutableArray *results = [[NSMutableArray alloc] init]，这应该会有所帮助.

You forgot to allocate your results array NSMutableArray *results = [[NSMutableArray alloc] init] this should help.

NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error]; NSArray* users = [json objectForKey:@"Users"]; NSMutableArray *results = [[NSMutableArray alloc] init]; for (id object in users) { Result *fetchedResults = [[Result alloc] init]; fetchedResults.name = (NSString *)[[element objectForKey:@"User"] objectForKey:@"name"]; fetchedResults.email = (NSString *)[[element objectForKey:@"User"] objectForKey:@"name"]; NSLog(@"%@", fetchedResults.name); [results addObject:fetchedResults]; } NSLog(@"%@", (NSString *)[[element objectForKey:@"User"] objectForKey:@"name"]); } NSLog(@"%d", [results count]); // returns 0