如何随机放置UIButton和值 [英] how to random placement of UIButton and value

问题描述

我有一个问题视图，会显示4个答案，只有1个是正确的。

i have a question view and will show 4 answers, only 1 are correct.

但我不希望同一个按钮始终是正确答案。

but i do not want the same button to be always the correct answer.

我想知道如何随机放置4个UIButton并且每次都值。

i will like to know how do i do a random placement of 4 UIButton and value every time.

< img src =https://i.stack.imgur.com/zNkdk.pngalt =在此处输入图片说明>

当用户转到此问题时再次答案将在不同的按钮

when user go to this question again the answer will be in differ button

我的X，y，W，H的位置

my placement of X,y,W,H

按钮1
5,219,230 ，45

button 1 5,219,230,45

按钮2
5,273,230,45

button 2 5,273,230,45

按钮3
244,224,230,45

button 3 244,224,230,45

按钮4
244,273,230,45

button 4 244,273,230,45

推荐答案

我碰巧正在开发类似的游戏应用程序，所以得到了一些肯定有用的代码。请在下面查看。请注意，我已将其设置为您为正确和不正确的按钮点击调用'correctAnswerMethod'和'wrongAnswerMethod'。

I happened to be working on a similar game app, so got some code which will definitely help. Check it out below. Note that I've put it in that you'd call a 'correctAnswerMethod' and a 'wrongAnswerMethod' for the correct and incorrect button clicks.

// Define the four buttons in their respective frames, create the first button as the correct one, we'll shuffle it later.
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button1 setTitle:@"Correct Answer" forState:UIControlStateNormal];
[button1 addTarget:self action:@selector(correctAnswerMethod:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button1];

UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button2 setTitle:@"Wrong Answer 1" forState:UIControlStateNormal];
[button2 addTarget:self action:@selector(wrongAnswerMethod:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button2];

UIButton *button3 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button3 setTitle:@"Wrong Answer 2" forState:UIControlStateNormal];
[button3 addTarget:self action:@selector(wrongAnswerMethod:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button3];

UIButton *button4 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[button4 setTitle:@"Wrong Answer 3" forState:UIControlStateNormal];
[button4 addTarget:self action:@selector(wrongAnswerMethod:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button4];


//Create an array with the rectangles used for the frames
NSMutableArray *indexArray = [NSMutableArray arrayWithObjects:
                              [NSValue valueWithCGRect:CGRectMake(5, 219, 230, 45)], 
                              [NSValue valueWithCGRect:CGRectMake(5, 273, 230, 45)], 
                              [NSValue valueWithCGRect:CGRectMake(244, 219, 230, 45)], 
                              [NSValue valueWithCGRect:CGRectMake(244, 273, 230, 45)], nil];

//Randomize the array
NSUInteger count = [indexArray count];
for (NSUInteger i = 0; i < count; ++i) {
    int nElements = count - i;
    int n = (arc4random() % nElements) + i;
    [indexArray exchangeObjectAtIndex:i withObjectAtIndex:n];
}

//Assign the frames
button1.frame = [((NSValue *)[indexArray objectAtIndex:0]) CGRectValue];
button2.frame = [((NSValue *)[indexArray objectAtIndex:1]) CGRectValue];
button3.frame = [((NSValue *)[indexArray objectAtIndex:2]) CGRectValue];
button4.frame = [((NSValue *)[indexArray objectAtIndex:3]) CGRectValue];

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