我的故事板中有42个按钮,我拍摄了一系列图像。在这个数组中共有7个图像。
NSArray *arrimg=[NSArray arrayWithObjects:@"book.png", @"lock.png", @"Exclamation.png", @"game.png", @"Music.png", @"Videos.png", @"Camera32.png", nil];
那么每次按钮时我怎么能随机拍摄图像呢?
我应该收集按钮还是做其他事情?
注意: - 我没有以编程方式使用按钮。
一个新的问题立场:如何从阵列中取出所有42个按钮的CGRect并在屏幕上随机显示。
NSMutableArray *mutarr=[[NSMutableArray alloc]init];
NSMutableArray *array=[NSMutableArray arrayWithArray:mutarr];
[array addObject:[NSValue valueWithCGRect:CGRectMake(50, 50, 47, 25)]];
[array addObject:[NSValue valueWithCGRect:CGRectMake(97, 50, 47, 25)]];
[array addObject:[NSValue valueWithCGRect:CGRectMake(144, 50, 47, 25)]];
CGRect someRect1 = [[array objectAtIndex:0] CGRectValue];
CGRect someRect2 = [[array objectAtIndex:0] CGRectValue];
CGRect someRect3 = [[array objectAtIndex:0] CGRectValue];
我不知道该怎么做。
答案 0 :(得分:1)
为0到41的每个42按钮添加标签
- (void)viewDidLoad {
[super viewDidLoad];
arrimg=[NSArray arrayWithObjects:@"book.png", @"lock.png", @"Exclamation.png", @"game.png", @"Music.png", @"Videos.png", @"Camera32.png", nil];
NSTimer *timer = [NSTimer timerWithTimeInterval:1.0f target:self selector:@selector(performAction) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}
-(void)performAction {
NSInteger randomNumberForImage = rand() % (arrimg.count);
NSInteger randomNumberForButton=rand()%(numberOfButton);// numberOfButton=42;
UIButton *btn=[self viewWithTag:randomNumberForButton];
[btn setImage:[UIImage imageNamed:[arrimg objectAtIndex:randomNumberForImage]] forState:UIControlStateNormal];
}
答案 1 :(得分:0)
尝试这个......
int length = [myArray count];
// Get random value between 0 and 99 if your count is 100
int randomindex = arc4random() % length;
Object randomObj = [myArray objectAtIndex:randomindex];
在函数中添加上述代码,并从viewWillAppear中调用它。
答案 2 :(得分:-1)
我试过这个并且有效......
在viewdidload中:
arrimg=[[NSMutableArray alloc]initWithObjects:@"book.png",@"lock.png",@"Exclamation.png",@"game.png",@"Music.png",@"Videos.png",@"Camera32.png", nil];
NSMutableArray *mutArrayb = [NSMutableArray arrayWithArray:arrimg];
NSUInteger count = [mutArrayb count];
if (count > 1)
{
for (NSUInteger i = count - 1; i > 0; --i) {
[mutArrayb exchangeObjectAtIndex:i withObjectAtIndex:arc4random_uniform((int32_t)(i + 1))];
NSLog(@"%@",[mutArrayb objectAtIndex:i]);
}
}
//rndmim=[[NSMutableArray alloc]initWithCapacity:7];
rndmim = [NSMutableArray arrayWithArray:mutArrayb];
for (int i=0; i<7; i++)
{
NSLog(@"%d %@",i,[rndmim objectAtIndex:i]);
[btn1 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn2 setImage:[UIImage imageNamed:[rndmim objectAtIndex:1]] forState:UIControlStateNormal];
[btn3 setImage:[UIImage imageNamed:[rndmim objectAtIndex:2]] forState:UIControlStateNormal];
[btn4 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn5 setImage:[UIImage imageNamed:[rndmim objectAtIndex:4]] forState:UIControlStateNormal];
[btn6 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn7 setImage:[UIImage imageNamed:[rndmim objectAtIndex:6]] forState:UIControlStateNormal];
[btn8 setImage:[UIImage imageNamed:[rndmim objectAtIndex:1]] forState:UIControlStateNormal];
[btn9 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn10 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn11 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn12 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn13 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn14 setImage:[UIImage imageNamed:[rndmim objectAtIndex:1]] forState:UIControlStateNormal];
[btn15 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn16 setImage:[UIImage imageNamed:[rndmim objectAtIndex:2]] forState:UIControlStateNormal];
[btn17 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn18 setImage:[UIImage imageNamed:[rndmim objectAtIndex:1]] forState:UIControlStateNormal];
[btn19 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn20 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn21 setImage:[UIImage imageNamed:[rndmim objectAtIndex:2]] forState:UIControlStateNormal];
[btn22 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn23 setImage:[UIImage imageNamed:[rndmim objectAtIndex:4]] forState:UIControlStateNormal];
[btn24 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn25 setImage:[UIImage imageNamed:[rndmim objectAtIndex:6]] forState:UIControlStateNormal];
[btn26 setImage:[UIImage imageNamed:[rndmim objectAtIndex:4]] forState:UIControlStateNormal];
[btn27 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn28 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn29 setImage:[UIImage imageNamed:[rndmim objectAtIndex:1]] forState:UIControlStateNormal];
[btn30 setImage:[UIImage imageNamed:[rndmim objectAtIndex:6]] forState:UIControlStateNormal];
[btn31 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn32 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn33 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn34 setImage:[UIImage imageNamed:[rndmim objectAtIndex:6]] forState:UIControlStateNormal];
[btn35 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn36 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn37 setImage:[UIImage imageNamed:[rndmim objectAtIndex:0]] forState:UIControlStateNormal];
[btn38 setImage:[UIImage imageNamed:[rndmim objectAtIndex:1]] forState:UIControlStateNormal];
[btn39 setImage:[UIImage imageNamed:[rndmim objectAtIndex:2]] forState:UIControlStateNormal];
[btn40 setImage:[UIImage imageNamed:[rndmim objectAtIndex:3]] forState:UIControlStateNormal];
[btn41 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
[btn42 setImage:[UIImage imageNamed:[rndmim objectAtIndex:5]] forState:UIControlStateNormal];
}
当我回到之前的视图并在此视图中再次返回时,图像再次发生变化......它运作良好....