從字典/數組中選擇一個隨機字符串在按下按鈕時顯示在UILabel中

Question

我一直在玩一個應用程序，當按下按鈕時會顯示一個隨機的笑話。

我已經宣佈了兩個插座（一個用於按鈕，一個用於顯示笑話的標籤）。當按下「jokeButton」時，我已成功獲取代碼以顯示一行文本。雖然，我怎樣才能輸入一大羣笑話，然後按下笑話按鈕時隨機顯示一個笑話。

我曾嘗試搞亂NSArray和NSDictionary，並做了一些谷歌搜索，但沒有成功。

@implementation ViewController 

- (void)viewDidLoad { 

[super viewDidLoad]; 

self->jokeLabel.text = (@"Welcome to The Joke Panel!"); 
} 

- (IBAction)jokeWasPressed:(id)sender { 
NSLog(@"Joke Button Was Pressed"); 
self->jokeLabel.text = (@"Why did the chicken cross the road? -- To get to the other side!"); 
} 

非常感謝您的幫助！ PS抱歉，我剛開始學習！

Answer 1

您正在創建一個字符串數組的正確軌道。下一步將生成一個隨機數並將其用作索引值以從數組中獲取字符串。

查詢arc4random瞭解有關創建隨機數字的信息。

Answer 2

//Declare "NSMutableArray *arrJokes;" globally 

//Initialize array to hold strings which will essentially be the Jokes 
arrJokes = [[NSMutableArray alloc] init]; 

//Add jokes 
[arrJokes addObject:@"Joke 1"]; 
[arrJokes addObject:@"Joke 2"]; 
[arrJokes addObject:@"Joke ..."]; 
[arrJokes addObject:@"Joke N"]; 

//generate a random index between 0 and arrJokes.count 
int randomIndex = arc4random()%arrJokes.count; 

//pick the string that is at this randomIndex in arrJokes and set it on the label 
[jokeLabel setText:arrJokes[randomIndex]];