如何清除UIButton背景圖片State？
[英]How to clear UIButton background image State?
問題描述
-(void) btnAction:(id) sender {
NSString *str =((UIButton*)sender).titleLabel.text;
NSLog(@"%@",str);
NSLog(@"%@",[dictionary objectForKey:@"option3"]);
correctAns=[dictionary objectForKey:@"answer"];
if(str==[dictionary objectForKey:@"option1"])
{
selectedAns=@"1";
if ([selectedAns compare:correctAns]==NSOrderedSame)
{
NSLog(@"this is correct");
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateSelected];
countCorrect++;
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
else
{
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option_red.png"] forState:UIControlStateSelected];
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
}
}
在 tableView 的初始化中
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"BeginingCell";
cell=(BeginingCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray *topLevelObjects=[[NSBundle mainBundle] loadNibNamed:@"BeginingCell" owner:self options:nil ];
for(id CurrentObject in topLevelObjects)
{
if ([CurrentObject isKindOfClass:[BeginingCell class]]) {
cell=(BeginingCell *) CurrentObject;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
break;
}
}
}
if(indexPath.row==0)
{
imageURL=[dictionary objectForKey:@"questionImage"];
// imageName=[dictionary objectForKey:@"questionImage"];
// imageURL=@"http://localhost:85/2/";
// imageURL=[imageURL stringByAppendingString:imageName];
NSURL *url = [NSURL URLWithString:imageURL];
NSData *data = [NSData dataWithContentsOfURL:(NSURL *)url];
UIImage *img = [[UIImage alloc] initWithData:data];
cell.lblScoreCurrent.text=[NSString stringWithFormat:@"%d", reloader];
cell.lblScore.text=@"/30";
cell.myImageView.image = img;
cell.SectionTitle.text=[dictionary objectForKey:@"question"];
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState: UIControlStateSelected];
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option_red.png"] forState: UIControlStateSelected];
}
更改您的代碼：
這一次它甚至沒有將背景圖像從 option.jpg 更改為綠色/紅色。在所有點擊中始終是 option.jpg。
* *並且使用我的代碼...我沒有收到任何錯誤... * *我用斷點測試它正在正確執行所有語句...甚至圖像的更改..但我看不到任何背景圖像更改。告訴我下一步是什么...
-(void) btnAction:(id) sender {
NSString *str =((UIButton*)sender).titleLabel.text;
NSLog(@"%@",str);
NSLog(@"%@",[dictionary objectForKey:@"option3"]);
correctAns=[dictionary objectForKey:@"answer"];
if([str isEqualToString:([dictionary objectForKey:@"option1"])])
{
selectedAns=@"1";
if ([selectedAns isEqualToString:correctAns])
{
NSLog(@"this is correct");
[((UIButton*)sender) setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateSelected];
countCorrect++;
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
else
{
[((UIButton*)sender) setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateSelected];
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
}
所有的邏輯都是好的..即使我正在計算分數..我測試了它......只是這個圖像問題不起作用......請告訴我一個方法......我在 iphone 中是全新的...... ..學習它..所以如果有什么錯誤或不好的做法，請給我適當的指導......
使用您的代碼后：
按鈕動作的代碼：
-(void) btnAction:(id) sender {
((UIButton *)sender).selected=FALSE;
NSString *str =((UIButton*)sender).titleLabel.text;
correctAns=[dictionary objectForKey:@"answer"];
if([str isEqualToString:([dictionary objectForKey:@"option1"])])
{
selectedAns=@"1";
NSLog(@"Selected Ans = %@",selectedAns);
NSLog(@"Correct = %@",correctAns);
if ([selectedAns isEqualToString:correctAns])
{
NSLog(@"this is correct");
[((UIButton*)sender) setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateSelected];
// sleep(3);
countCorrect++;
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
else
{
[((UIButton*)sender) setBackgroundImage:[UIImage imageNamed:@"option_red.png"] forState:UIControlStateSelected];
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
((UIButton*)sender).selected = true;
}
tableView 索引路徑中的代碼：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"BeginingCell";
cell=(BeginingCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray *topLevelObjects=[[NSBundle mainBundle] loadNibNamed:@"BeginingCell" owner:self options:nil ];
for(id CurrentObject in topLevelObjects)
{
if ([CurrentObject isKindOfClass:[BeginingCell class]]) {
cell=(BeginingCell *) CurrentObject;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
break;
}
}
}
if(indexPath.row==0)
{
imageURL=[dictionary objectForKey:@"questionImage"];
// imageName=[dictionary objectForKey:@"questionImage"];
// imageURL=@"http://localhost:85/2/";
// imageURL=[imageURL stringByAppendingString:imageName];
NSURL *url = [NSURL URLWithString:imageURL];
NSData *data = [NSData dataWithContentsOfURL:(NSURL *)url];
UIImage *img = [[UIImage alloc] initWithData:data];
cell.lblScoreCurrent.text=[NSString stringWithFormat:@"%d", reloader];
cell.lblScore.text=@"/30";
cell.myImageView.image = img;
cell.SectionTitle.text=[dictionary objectForKey:@"question"];
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn2 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn3 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn4 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
cell.ansBtn1.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.ansBtn2.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.ansBtn3.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.ansBtn4.titleLabel.lineBreakMode = UILineBreakModeWordWrap;
cell.ansBtn1.titleLabel.textAlignment = UITextAlignmentCenter;
cell.ansBtn2.titleLabel.textAlignment = UITextAlignmentCenter;
cell.ansBtn3.titleLabel.textAlignment = UITextAlignmentCenter;
cell.ansBtn4.titleLabel.textAlignment = UITextAlignmentCenter;
[cell.ansBtn1 setTitle:[dictionary objectForKey:@"option1"] forState:UIControlStateNormal];
[cell.ansBtn2 setTitle:[dictionary objectForKey:@"option2"] forState:UIControlStateNormal];
[cell.ansBtn3 setTitle:[dictionary objectForKey:@"option3"] forState:UIControlStateNormal];
[cell.ansBtn4 setTitle:[dictionary objectForKey:@"option4"] forState:UIControlStateNormal];
[cell.ansBtn1 addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.ansBtn2 addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.ansBtn3 addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.ansBtn4 addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
[cell.ansBtn1 addTarget:self action:@selector(btnActionUp:) forControlEvents:UIControlEventTouchDown];
//cell.ansBtn1.showsTouchWhenHighlighted=TRUE;
cell.ansBtn2.showsTouchWhenHighlighted=TRUE;
cell.ansBtn3.showsTouchWhenHighlighted=TRUE;
cell.ansBtn4.showsTouchWhenHighlighted=TRUE;
}
return cell;
}
1 個解決方案
解決方案1
0 已采納 2011-04-30 08:18:13
我仍然不完全理解您的問題..如果您想要一個正常的按鈕圖像，而另一個當用戶觸摸按鈕時，您可以在創建按鈕本身時直接提供它們..單擊按鈕時無需更改圖像..
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn1 setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState: UIControlStateHighlighted];
[cell.ansBtn2 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn2 setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState: UIControlStateHighlighted];
[cell.ansBtn3 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn3 setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState: UIControlStateHighlighted];
[cell.ansBtn4 setBackgroundImage:[UIImage imageNamed:@"option.png"] forState: UIControlStateNormal];
[cell.ansBtn4 setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState: UIControlStateHighlighted];
由於您使用了按鈕的突出顯示 state，我假設您僅在用戶手放在按鈕上時才想要綠色圖像（即當用戶釋放鍵時更改為正常圖像..）。在這種情況下，上面的代碼將起作用..
但是，如果您希望按鈕圖像即使在用戶釋放后仍保持綠色，那么您應該使用 UIButton 的 selected (UIControlStateSelected) 屬性。
編輯：看到評論后..
在這種情況下，當按鈕分配和初始化只給出正常的 state 圖像..
[cell.ansBtn setBackgroundImage:[UIImage imageNamed:@"option.png" forState:UIControlStateNormal]];
並單擊按鈕。
-(void)optionButtonClicked:(UIButton*)sender{
if(correct){
// green image..
[sender setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateSelected];
}else{//red image
[sender setBackgroundImage:[UIImage imageNamed:@"option_red.png"] forState:UIControlStateSelected];
}
sender.selected = true;
}
第二次編輯：看到編輯后的問題
首先，永遠不要在這樣的兩個字符串之間進行比較..
if(str==[dictionary objectForKey:@"option1"])
而是使用 compare() function 或 isEqualToString() function 進行比較。
第二件事，您在 btnAction function 中使用“單元格”。 我不敢相信它在編譯時沒有顯示“單元格未聲明”錯誤。 第三，糾正以上兩個錯誤。 第四，糾正錯誤后嘗試使用斷點調試代碼。 你已經試過了嗎？ 在 btnAction function 中放置一個斷點，看看它是否按照你想要的方式執行。然后用你的觀察更新這個問題。目前，你的代碼中有很多錯誤，所以我不知道是哪一個導致了什么..對我來說，這段代碼根本不應該被編譯..
第三次編輯：只是事后嘗試這個..
-(void) btnAction:(id) sender {
((UIButton*)sender).selected = FALSE;
NSString *str =((UIButton*)sender).titleLabel.text;
NSLog(@"%@",str);
NSLog(@"%@",[dictionary objectForKey:@"option3"]);
correctAns=[dictionary objectForKey:@"answer"];
if([str isEqualToString:([dictionary objectForKey:@"option1"])]){
selectedAns=@"1";
If ([selectedAns compare:correctAns]==NSOrderedSame) {
NSLog(@"this is correct");
[((UIButton*)sender) setBackgroundImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateSelected];
countCorrect++;
// cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}else {
[((UIButton*)sender) setBackgroundImage:[UIImage imageNamed:@"option_red.png"] forState:UIControlStateSelected];
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
((UIButton*)sender).selected = true;
}
}
第四次編輯：再想一想
-(void) btnAction:(id) sender {
NSString *str =((UIButton*)sender).titleLabel.text;
NSLog(@"%@",str);
NSLog(@"%@",[dictionary objectForKey:@"option3"]);
correctAns=[dictionary objectForKey:@"answer"];
if([str isEqualToString:([dictionary objectForKey:@"option1"])]){
selectedAns=@"1";
If ([selectedAns compare:correctAns]==NSOrderedSame) {
NSLog(@"this is correct");
[((UIButton*)sender) setImage:[UIImage imageNamed:@"option_green.png"] forState:UIControlStateNormal];
countCorrect++;
// cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}else {
[((UIButton*)sender) setImage:[UIImage imageNamed:@"option_red.png"] forState:UIControlStateNormal];
cell.lblRating.text=[NSString stringWithFormat:@"%i", countCorrect];
}
}
}
以編程方式為UIButton創建突出顯示的狀態背景圖像
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