Ios 导致撞车的按钮

我这里有点问题。我已经创建了一个按钮，希望它在被点击时改变它的背景图像。它不起作用了，我犯了一个SIGABRT错误

代码如下：

- (IBAction)indicatedButton:(id)sender
{
if ([sender isSelected])
{
    [sender setBackgroundImage:[UIImage imageNamed:@"completeTickBox.png"]];
}
else
{
    [sender setBackgroundImage:[UIImage imageNamed:@"blankTickBox.png"]];
}

}我想你想要：

[sender setBackgroundImage:[UIImage ....] forState:UIControlStateNormal];

以下是有关该方法的相关Apple文档：

因此，在您的情况下，它将是：

- (IBAction)indicatedButton:(id)sender
{

    if ([sender isSelected])
    {
        [sender setBackgroundImage:[UIImage imageNamed:@"completeTickBox.png"] forState:UIControlStateNormal];
    }
    else
    {
        [sender setBackgroundImage:[UIImage imageNamed:@"blankTickBox.png"] forState:UIControlStateNormal];
    }

}

---

这里假设“sender”实际上是一个UIButton。

您必须将sender强制转换为UIButton，因为sender是（id），而您想要的对象是UIButton 把这一行放在你的代码中

UIButton*btn=sender

- (IBAction)indicatedButton:(id)sender
{
    UIButton *btn= sender;
    if ([btn isSelected])
    {
        [btn setBackgroundImage:[UIImage imageNamed:@"completeTickBox.png"] forState:UIControlStateNormal];
    }
    else
    {
        [btn setBackgroundImage:[UIImage imageNamed:@"blankTickBox.png"] forState:UIControlStateNormal];
    }

}

首先验证您是否得到了一个UIButton

-(IBAction indicatedButton:(id)sender
{
    if ([sender isKindOfClass:[UIButton class]])
    {
    }
}

约定提示：对象属性的最佳实践是使用点表示法（isSelected是UIButton的BOOL属性）

如果你只是使用一个普通的按钮，但是你想要的是一个“切换”按钮（它是一个图像，或者是一个不同的图像），那么你需要为按钮设置selected state属性，这样它就知道它在被触摸后被选中了（反之亦然，如果它没有）

如果您知道要使用按钮，那么也可以将按钮发送者类型从id更改为UIButton，而不是使用内省（检查类类型）。您无需将按钮重新连接到情节提要/笔尖即可完成此操作

-(IBAction indicatedButton:(UIButton *)sender
{
        if (sender.isSelected)
        {
            [sender setSelected:NO]; // if we were selected, we won't be now
            UIImage *buttonImage = [UIImage imageNamed:@"completeTickBox.png"];
            [sender setImage:buttonImage forState:UIControlStateNormal];
        }
        else if (!sender.isSelected)
        {
            [sender setSelected:YES]; // if we aren't selected, we will be now
            UIImage *buttonImage = [UIImage imageNamed:@"blankTickBox.png"];
            [sender setImage:buttonImage forState:UIControlStateNormal];
        }
}

仅供参考：当您键入sender而不是允许其为泛型类型时，这种问题会变得很明显：
indicatedButton:（UIButton*）sender
，例如，此处。
-(IBAction indicatedButton:(id)sender
{
    if ([sender isKindOfClass:[UIButton class]])
    {
        if (sender.isSelected)
        {
            [sender setSelected:NO]; // if we were selected, we won't be now
            UIImage *buttonImage = [UIImage imageNamed:@"completeTickBox.png"];
            [sender setImage:buttonImage forState:UIControlStateNormal];
        }
        else if (!sender.isSelected)
        {
            [sender setSelected:YES]; // if we aren't selected, we will be now
            UIImage *buttonImage = [UIImage imageNamed:@"blankTickBox.png"];
            [sender setImage:buttonImage forState:UIControlStateNormal];
        }
    }
}

-(IBAction indicatedButton:(UIButton *)sender
{
        if (sender.isSelected)
        {
            [sender setSelected:NO]; // if we were selected, we won't be now
            UIImage *buttonImage = [UIImage imageNamed:@"completeTickBox.png"];
            [sender setImage:buttonImage forState:UIControlStateNormal];
        }
        else if (!sender.isSelected)
        {
            [sender setSelected:YES]; // if we aren't selected, we will be now
            UIImage *buttonImage = [UIImage imageNamed:@"blankTickBox.png"];
            [sender setImage:buttonImage forState:UIControlStateNormal];
        }
}