随机播放NSMutableArray而不重复，并显示在UIButton中 [英] shuffle NSMutableArray without repetition and showing in a UIButton

问题描述

在我看来，我有12个按钮，并且一个数组包含6个名称，我想在 UIButton 标题中打印数组名称.这是我的代码:

In my view, i have 12 buttons,and a array contains 6 names , i want to print the array names in UIButton title. Here's my code:

texts = [[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",nil];
UIButton *button;
NSString *name;
NSUInteger count = [texts count];
int i=0;

for(UIView *view in self.view.subviews)
{
    if([view isKindOfClass:[UIButton class]])
    {
        button= (UIButton *)view;
        if(button.tag >= 1||button.tag <= 20)
        {
            int value = rand() % ([texts count] -1) ;
            int myTag= i+1;
            button = [self.view viewWithTag:myTag];
            name=[NSString stringWithFormat:@"%@",[texts objectAtIndex:value]];
            [button setTitle:name forState:UIControlStateNormal];
            NSLog(@"current  name :%@",name);
        }
        i++;
    }

}
[super viewDidLoad];

我面临的问题是:

1. 在重排值时，我尝试使用改组NSMutableArray的最佳方法是什么?，它不起作用.

我想在12个按钮中包含6个标题，这意味着每个标题将在2个按钮中.请帮我解决这个问题.我应该进行哪些更改?

I want 6 titles in 12 button that means each title will be in 2 buttons. Please help me solve this issue. What changes should I make?

推荐答案

基本上，您需要将改组逻辑与为按钮功能添加名称分开.因此，请先随机排列数组，然后设置按钮的名称.

Basically you need to separate the shuffling logic from adding name to button feature. So first shuffle the array and then set the name of buttons.

[super viewDidLoad]; //Always super call should be the first call in viewDidLoad
texts = [[NSMutableArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6", @"1",@"2",@"3",@"4",@"5",@"6", nil];
//adding all 12 button titles to array, use your own logic to create this array with 12 elements if you have only 6 elements

NSUInteger count = [texts count];

for (NSUInteger i = 0; i < count; ++i) {
        // Select a random element between i and end of array to swap with.
        NSInteger nElements = count - i;
        NSInteger n = (arc4random() % nElements) + i;
        [texts exchangeObjectAtIndex:i withObjectAtIndex:n];
}

UIButton *button = nil;
NSString *name = nil;
int i = 0;

for(UIView *view in self.view.subviews)
{
    if([view isKindOfClass:[UIButton class]])
    {
        button= (UIButton *)view;
        if(button.tag >= 1 && button.tag <= 20)
        {
            name = [NSString stringWithFormat:@"%@",[texts objectAtIndex:i]];
            //assuming that the above texts array count and number of buttons are the same, or else this could crash
            [button setTitle:name forState:UIControlStateNormal];
            NSLog(@"current  name :%@",name);
            i++;
        }
    }
}

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