选择一个按钮时如何更改多个按钮的按钮图像?

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【中文标题】选择一个按钮时如何更改多个按钮的按钮图像?【英文标题】:How to change the button image of multiple buttons when a button is selected? 【发布时间】:2013-10-29 06:26:21 【问题描述】:

我已经动态创建了几个月的 12 个按钮,并为按钮设置了不同的图像。所有按钮都有标签。我使用 switch 方法访问带有标签的每个按钮。选择时我更改了按钮的图像。 But i can't changed the image of other buttons as unselected when a button is selected.

这是我的代码。

//Button Creation in scroll view
NSMutableArray* buttonArray = [[NSMutableArray alloc] init];

for(int i = 0; i < 12; i++)

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setFrame:CGRectMake(0,5,37,37)];
    [btn setTag:i];
    [btn setImage:[UIImage imageNamed:[buttonImageArray objectAtIndex:i]] forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(monthBtnAction:) forControlEvents:UIControlEventTouchUpInside];
    [buttonArray addObject:btn];
    [btn release];


menuScrollView.showsHorizontalScrollIndicator = FALSE;
menuScrollView.showsVerticalScrollIndicator = FALSE;
menuScrollView.scrollEnabled = YES;
menuScrollView.bounces = FALSE;
menuScrollView.delegate = self;
menuButtons = buttonArray;

float totalButtonWidth = 15;

for(int i = 0; i < [menuButtons count]; i++)

    UIButton *btn1 = [menuButtons objectAtIndex:i];

    CGRect btnRect = btn1.frame;
    btnRect.origin.x = totalButtonWidth;
    [btn1 setFrame:btnRect];
    btn1.userInteractionEnabled=YES;
    [menuScrollView addSubview:btn1];
    totalButtonWidth += btn1.frame.size.width+25;


[menuScrollView setContentSize:CGSizeMake(totalButtonWidth, 45)];
[self.view addSubview:menuScrollView];
//Button Action Method
-(IBAction)monthBtnAction:(id)sender 
 NSLog(@"Button Tag is : %i",[sender tag]);

switch ([sender tag]) 
    case 0:
        NSLog(@"Tag:%d January",[sender tag]);
        flag0 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);
        [self viewWillAppear:NO];
        break;
    case 1:
        NSLog(@"Tag:%d Febraury",[sender tag]);
        flag1 = YES;

        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];


        break;
    case 2:
        NSLog(@"Tag:%d March",[sender tag]);
        flag2 = YES;

        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];

       break;
    case 3:
        NSLog(@"Tag:%d April",[sender tag]);
        flag3 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];


        break;
    case 4:
        NSLog(@"Tag:%d May",[sender tag]);
        flag4 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];


        break;
    case 5:
        NSLog(@"Tag:%d June",[sender tag]);
        flag5 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];


        break;
    case 6:
        NSLog(@"Tag:%d July",[sender tag]);
        flag6 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];

        break;
    case 7:
        NSLog(@"Tag:%d August",[sender tag]);
        flag7 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];

        break;
    case 8:
        NSLog(@"Tag:%d September",[sender tag]);
        flag8 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];

        break;
    case 9:
        NSLog(@"Tag:%d October",[sender tag]);
        flag9 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];


        break;
    case 10:
        NSLog(@"Tag:%d November",[sender tag]);
        flag10 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];

        break;
    case 11:
        NSLog(@"Tag:%d December",[sender tag]);
        flag11 = YES;
        theButton = (UIButton *)sender;
        [theButton setImage:[UIImage imageNamed:[buttonSelectArray objectAtIndex:[sender tag]]] forState:UIControlStateNormal];
        dateValue = [sender tag]+1;
        NSLog(@"dateValue:%d",dateValue);

        [self viewWillAppear:NO];

        break;        


【问题讨论】:

【参考方案1】:

获取一个 NSButton 类型的类变量,并在 IBAction 方法结束时(在 switch-case 之后),将其值设置为 sender。这将保存最后点击按钮的标签。

现在在IBAction方法的开始(切换前),设置你保存的按钮的图像为取消选择图像。

**.h file**
UIButton* lastClickedButton;

// Your IBAction
-(IBAction)monthBtnAction:(id)sender

    [lastClickedButton setImage:[UIImage imageNamed:[buttonUnselectArray objectAtIndex:[lastClickedButton tag]]] forState:UIControlStateNormal];

    //Your switch statement 
    switch
     
      ----
      ----
    

    lastClickedButton = sender;

【讨论】:

它对我有用。您的答案中的一项更正。在 .h 文件中,它不是 NSButton 而是它的 UIButton。请更正。 哦,是的。谢谢。我在 OSX 上工作,所以错过了 :)。现已更正。 嗯,这个答案对我也有帮助。谢谢你:)

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