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在uibutton中实现切换功能

uibutton uiimageview cocoa-touch ios objective-c

Souljacker · 技术社区 · 15 年前

我想知道如何将切换功能添加到 UIButton ,类似于用户点击一个未选中的按钮,该按钮变为选中状态,并保持选中状态,直到用户再次点击该按钮,使其像以前一样未选中。

我想做一个 IBAction 哪个选项将其从未选定更改为选定,我如何才能这样做?

以下是我的尝试:

-(IBAction)toggle {

    //Toggle on implementation.

        button.selected = YES;
        button.highlighted = NO;
        button.enabled = YES;

    //Toggle off implementation.

    if (button.highlighted == YES) {

        button.selected = NO;
        button.highlighted = YES;
        button.enabled = NO;
    }
}

问题…

-(IBAction)toggleFav {

    if (favButton == nil) {

        UIImage *unselectedImage = [UIImage imageNamed:@"favUntapped.png"];
        UIImage *selectedImage = [UIImage imageNamed:@"favTapped.png"];
        [favButton setImage:unselectedImage forState:UIControlStateNormal];
        [favButton setImage:selectedImage forState:UIControlStateSelected];
        [favButton setFrame:CGRectMake(0, 0, 40, 40)];
    }       

    if([favButton isSelected]){

        //Add to menu.
        [favButton setSelected:NO];
    } else {

        //Remove from menu.

        [favButton setSelected:YES];
    }
}

4 回复 | 直到 15 年前

vikingosegundo 15 年前

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
        UIImage *unselectedImage = [UIImage imageNamed:@"unselected.png"];
        UIImage *selectedImage = [UIImage imageNamed:@"selected.png"];
        UIButton *b = [UIButton buttonWithType:UIButtonTypeCustom];
        [b setBackgroundImage:unselectedImage forState:UIControlStateNormal];
        [b setBackgroundImage:selectedImage forState:UIControlStateSelected];
        [b addTarget:self action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
        [b setFrame:CGRectMake(0, 0, 40, 40)];
        [cell.contentView addSubview:b];
    }       
    return cell;
}

-(void) buttonPressed:(UIButton *)sender
{
    if([sender isSelected]){
        //...
        [sender setSelected:NO];
    } else {
        //...    
        [sender setSelected:YES];
    }

}

编辑
你的 toggleFav 代码没有多大意义。
if (favButton == nil) { 检查,如果 favButton 存在。但是如果你把它和ib连接起来,它就应该一直在那里。如果不是,按钮怎么能调用这个方法?这样做:

-(void)viewDidLoad
{
    //....
    UIImage *unselectedImage = [UIImage imageNamed:@"favUntapped.png"];
    UIImage *selectedImage = [UIImage imageNamed:@"favTapped.png"];
    [favButton setImage:unselectedImage forState:UIControlStateNormal];
    [favButton setImage:selectedImage forState:UIControlStateSelected];
    [favButton setFrame:CGRectMake(0, 0, 40, 40)];
    //....
}


-(IBAction)toggleFav:(UIButton *)sender {
    if([sender isSelected]){
        //...
        [sender setSelected:NO];
    } else {
        //...    
        [sender setSelected:YES];
    }
}

编辑
Here 您将发现一个带有detailview的示例项目,其中包含一个具有两个状态的按钮。
音符: 我正在保存在nsuserdefaults中选择的按钮的信息。你不应该那样做。相反,您需要将其保存在模型中。但是由于我没有关于你的模型的信息,我只是在使用nsuserdefaults。

Rogers 14 年前

-(void)hitButton:(UIButton*)button
{
    buttonOnFlag = !buttonOnFlag;
    if( buttonFlag )
        [self performSelector:@selector(setHighlight:) withObject:button afterDelay:0];
}

- (void)setHighlight:(UIButton*)button 
{
    button.highlighted = true;
}

KingofBliss 15 年前

使用button.highlighted属性

halfer Jatin Pandey 7 年前

您应该这样编码:

-(IBAction)toggle:(id)sender {

    //Toggle on implementation.
   if (sender.highlighted == NO)
     {
        sender.selected = YES;
        sender.highlighted = NO;
        sender.enabled = YES;
     }

    //Toggle off implementation.

   else{

        sender.selected = NO;
        sender.highlighted = YES;
        sender.enabled = NO;
    }
}