shuffle NSMutableArray不重复并显示在UIButton中
在我看来，我有12个按钮，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：
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：
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虽然洗牌的价值正在重复，但我试着用什么是最好的方式来洗牌NSMutableArray？ ，它不起作用。
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我希望在12个按钮中有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。 我应该做些什么改变？
基本上，您需要将重排逻辑与添加名称分离为按钮function。 所以首先将数组洗牌，然后设置按钮的名称。
[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++; } } }
制作NSMutableArray的类别
@implementation NSMutableArray (ArrayUtils) - (void)shuffle{ static BOOL seeded = NO; if(!seeded) { seeded = YES; srandom(time(NULL)); } NSUInteger count = [self count]; for (NSUInteger i = 0; i < count; ++i) { // Select a random element between i and end of array to swap with. int nElements = count - i; int n = (random() % nElements) + i; [self exchangeObjectAtIndex:i withObjectAtIndex:n]; } } @end