触摸按钮时设置背景图片
问题描述：
点击按钮我正在更改背景图片。这只是停留在突出显示的状态。我想在点击按钮后保留绿色/红色背景图像。触摸按钮时设置背景图片
如何在我的代码中执行此操作？对不起，我是新手...
- (void)setCorrectAndWrongAnswerBackgroundImagesForOptions
{
int correctAns = [[currentQuestionDict objectForKey:kQuizAnswer] intValue];
int i;
int count = [_optionsButtonsArray count];
for (i=0; i<count; i++)
{
UIButton* optionButton = [_optionsButtonsArray objectAtIndex:i];
NSString* optionBgImageName = [NSString stringWithFormat:@"optionBg_default%d",(i+1)];
NSString* optionBgRedImageName = [NSString stringWithFormat:@"optionBg_red%d",(i+1)];
NSString* optionBgGreenImageName = [NSString stringWithFormat:@"optionBg_green%d",(i+1)];
if (optionButton.tag == correctAns)
{
[optionButton setBackgroundImage:[UIImage imageNamed:[HAUtilities resourceNameForString:optionBgImageName]] forState:UIControlStateNormal];
[optionButton setBackgroundImage:[UIImage imageNamed:[HAUtilities resourceNameForString:optionBgGreenImageName]] forState:UIControlStateHighlighted];
}
else {
[optionButton setBackgroundImage:[UIImage imageNamed:[HAUtilities resourceNameForString:optionBgImageName]] forState:UIControlStateNormal];
[optionButton setBackgroundImage:[UIImage imageNamed:[HAUtilities resourceNameForString:optionBgRedImageName]] forState:UIControlStateHighlighted];
}
}
}
答
你可以做这样的事情在选项按钮选择
dispatch_async(dispatch_get_main_queue(), ^{
[sender setHighlighted:YES];
});
这将使选项按钮高亮显示状态保持，直到你把它设置为NO再次。
答
您想在正在更改突出显示状态的时刻改变正常状态的颜色。
如下更改代码：
- (void)setCorrectAndWrongAnswerBackgroundImagesForOptions
{
int correctAns = [[currentQuestionDict objectForKey:kQuizAnswer] intValue];
int i;
int count = [_optionsButtonsArray count];
for (i=0; i<count; i++)
{
UIButton* optionButton = [_optionsButtonsArray objectAtIndex:i];
NSString* optionBgImageName = [NSString stringWithFormat:@"optionBg_default%d",(i+1)];
NSString* optionBgRedImageName = [NSString stringWithFormat:@"optionBg_red%d",(i+1)];
NSString* optionBgGreenImageName = [NSString stringWithFormat:@"optionBg_green%d",(i+1)];
if (optionButton.tag == correctAns)
{
[optionButton setBackgroundImage:[UIImage imageNamed:[HAUtilities resourceNameForString:optionBgGreenImageName]] forState:UIControlStateNormal];
}
else {
[optionButton setBackgroundImage:[UIImage imageNamed:[HAUtilities resourceNameForString:optionBgRedImageName]] forState:UIControlStateNormal];
}
}
}
答
在你的故事板时，选择按钮，在右侧栏中的是“突出”的选项下拉菜单。点击此按钮并设置突出显示（选中）时按钮所需的属性，如不同的背景图像。