Question

我的应用程序出现问题。我有一个登录屏幕，我用一个按钮移动到下一个视图控制器，然后我有3个按钮。 2是隐藏的，1不是。我想要一个不是（红色圆圈）点击运行虚拟按钮更换器。然而，在这个空白中，我为textview.setText(Html.fromHtml("First line,<br/>Second line"))我创建的RandomNumberButton创建了一个随机数。我做了一个int声明：

如果randomnumberbutton大于30，那么if和redcircle.hidden = YES;以及Bluecircle.Hidden = NO;。

问题是我希望按钮在一定时间内可见。所以我将它放入void buttonchanger。

yellowcircle.hidden = YES;

每当我运行这段代码时，它都会给我错误：

线程1 EXC_BAD_ACCESS代码= 2

ButtonTime是一个1,3或4.0秒的随机数。 setbuttonEnabled基本上是一个空洞{{1}}

底线：我在特定行遇到错误[NSTimer scheduledTimerWithTimeInterval:ButtonTime target:self selector:@selector(setButtonEnabled) userInfo:nil repeats:NO];：

set bluecircle.hidden = YES;

编辑：我将arc4random更改为arc4random_uniform但我仍然得到相同的错误

.m文件：

Thread 1 EXC_BAD_ACCESS code=2

.h文件

[NSTimer scheduledTimerWithTimeInterval:ButtonTime target:self selector:@selector(setButtonEnabled) userInfo:nil repeats:NO];`

Answer 1

代码2 =无限循环。

ButtonChanger正在调用自己，因为条件总是满足，因此创建无限数量的计时器直到系统放弃。

您应该遵循如何编写清晰可读代码的指南。避免在类或范围之外声明低级属性。还要记住，属性以小写和类大写开头。对象的引用/指针也是属性。

这部分是你的代码看起来如何。

#import "ViewController.h"

@interface ViewController ()
@property (nonatomic, strong) UIButton *blueCircleButton;
@property (nonatomic, strong) UIButton *redCircleButton;
@property (nonatomic, strong) UIButton *yellowCircleButton;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    self.blueCircleButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.blueCircleButton.frame = CGRectMake(50, 0, 100, 100);
    self.blueCircleButton.backgroundColor = [UIColor blueColor];
    self.redCircleButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.redCircleButton.frame = CGRectMake(50, 100, 100, 100);
    self.redCircleButton.backgroundColor = [UIColor redColor];
    [self.redCircleButton addTarget:self action:@selector(redButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    self.yellowCircleButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    self.yellowCircleButton.frame = CGRectMake(50, 200, 100, 100);
    self.yellowCircleButton.backgroundColor = [UIColor yellowColor];
    for (UIView *view in @[self.blueCircleButton, self.redCircleButton, self.yellowCircleButton]) {
        [self.view addSubview:view];
    }

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void)viewDidAppear:(BOOL)animated{
    self.yellowCircleButton.hidden = YES;
    self.blueCircleButton.hidden = YES;
    self.redCircleButton.hidden = NO;
}

-(void)enableBlueCircle:(NSTimer*)timer {
    self.blueCircleButton.hidden = YES;
}

-(void)enableYellowCircle:(NSTimer*)timer {
    self.yellowCircleButton.hidden = YES;
}

-(void)buttonChanger{
    NSInteger randomNumberButton = arc4random() % 100;

    if (randomNumberButton>30) {
        self.blueCircleButton.hidden = NO;
        [NSTimer scheduledTimerWithTimeInterval:[self generateButtonTime] target:self selector:@selector(enableBlueCircle:) userInfo:nil repeats:NO];

        self.redCircleButton.hidden = YES;
        self.yellowCircleButton.hidden = YES;
    }
    if (randomNumberButton<30) {
        self.yellowCircleButton.hidden = NO;
        [NSTimer scheduledTimerWithTimeInterval:[self generateButtonTime] target:self selector:@selector(enableYellowCircle:) userInfo:nil repeats:NO];
        self.redCircleButton.hidden = YES;
        self.blueCircleButton.hidden = YES;
    }

//    if (self.yellowCircleButton.hidden = YES, self.blueCircleButton.hidden = YES, self.redCircleButton.hidden = YES) {
//        [self buttonChanger];
//    }
}

- (void)redButtonAction:(UIButton *)button {
    [self buttonChanger];
}

-(double)generateButtonTime {
    NSInteger randomNumber = arc4random() % 100;
    double buttomTime = 0;
    if (randomNumber>50) {
        buttomTime = 3.0;
    }

    if (randomNumber<50) {
        buttomTime = 1.0 ;
    }

    if (randomNumber>10) {
        buttomTime = 4.0 ;
    }
    return buttomTime;
}

@end

当尝试使按钮消失一定秒时，exc_bad_access

1 个答案: