xcode 以编程方式更改状态的按钮

Button changing of state programmatically

提问by Bazinga

Im really having a problem with my image with button frame, What I want is: 1. When it is selected it will have a checkmark 2. When the view is dismissed then returned back to the previous screen it will still have the check in the image selected 3. When I tap the selected image or another image it will remove the checkmark.

我的按钮框架图像确实有问题，我想要的是： 1. 当它被选中时，它会有一个复选标记 2. 当视图被关闭然后返回到上一个屏幕时，它仍然会在选定的图像 3. 当我点击选定的图像或其他图像时，它会删除复选标记。

I was able to do it but I'm having problem with the setting of image:

我能够做到，但我在设置图像时遇到了问题：

What I want is this:

我想要的是这个：

UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
[myButton setEnabled:NO];

But this is the function I needed:

但这是我需要的功能：

UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
[myButton setImage:bgImage forState:UIControlStateSelected];
[myButton setSelected:YES];

Here is the code below(If there is something wrong with what I'm doing please tell me, Thanks):

这是下面的代码（如果我正在做的事情有问题，请告诉我，谢谢）：

- (void)viewDidLoad {
    UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
    [myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
    [myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
    // Create view
    UIScrollView *view = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f,0.0f,1024.0f,768.0f)];

    int row = 0;
    int column = 0;
    for(int i = 0; i < _thumbs.count; ++i) {

        UIImage *thumb = [_thumbs objectAtIndex:i];
        myButton = [UIButton buttonWithType:UIButtonTypeCustom];
        myButton.frame = CGRectMake(column*140+24, row*150+10, 100, 100);
        [myButton setImage:thumb forState:UIControlStateNormal];
        [myButton addTarget:self 
                     action:@selector(buttonClicked:) 
           forControlEvents:UIControlEventTouchUpInside];
        myButton.tag = i; 
        NSLog(@"%i",i);

        NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
        NSInteger selectedImageSlot1 = [prefs integerForKey:@"selected1"];

        if ( selectedImageSlot1 == i){
            [self turnButtonToSelected];
        } 

        [view addSubview:myButton];

        if (column == 6) {
            column = 0;
            row++;
        } else {
            column++;
        }

    }

    [view setContentSize:CGSizeMake(1024, (row+1) * 150 + 10)];
}

- (void)turnButtonToSelected
{       UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
    [myButton setBackgroundImage:bgImage forState:UIControlStateNormal];
    [myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
    [myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
    [myButton setEnabled:NO];
}
- (void)highlightButton:(UIButton *)a {
    //[self turnButtonToSelected];    
}
- (IBAction)buttonClicked:(id)sender {
    myButton = (UIButton *)sender;
    self.selectedImage = [_images objectAtIndex:myButton.tag];

    if (myButton.selected) {

        [sender setSelected:NO];

    }else {

        UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
        [sender setImage:bgImage forState:UIControlStateSelected];
        [sender setSelected:YES];
    }


    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    [prefs setInteger:myButton.tag forKey:@"slot1"];

    [[NSUserDefaults standardUserDefaults] setInteger:myButton.tag forKey:@"selected1"];

    [[NSUserDefaults standardUserDefaults] synchronize];


    [self performSelector:@selector(highlightButton:) withObject:sender afterDelay:0.0];
    [self dismissModalViewControllerAnimated:NO];

}

Or is there a way to forcefully make a button enabled whenever it is disabled when tapped also?

或者有没有办法在点击时强制启用按钮？

回答by Chris

I have just tried this on a different approach.

我刚刚用不同的方法尝试过这个。

For me it works just fine and achieves your effect.

对我来说它工作得很好并达到你的效果。

Let me know if you need further explanation or the entire Xcode project.

如果您需要进一步的解释或整个 Xcode 项目，请告诉我。

- (void)viewDidLoad
{
    [super viewDidLoad];

    //button 1
    UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
    imageButton.frame = CGRectMake(30, 50, 100, 80);
    UIImage *btnImage = [UIImage imageNamed:@"DSC_5359.JPG"];
    [imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
    [imageButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];

    //button 2
    UIButton *imageButton2 = [UIButton buttonWithType:UIButtonTypeCustom];
    imageButton2.frame = CGRectMake(180, 50, 100, 80);
    UIImage *btnImage2 = [UIImage imageNamed:@"DSC_5355.JPG"];
    [imageButton2 setBackgroundImage:btnImage2 forState:UIControlStateNormal];
    [imageButton2 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];

    [self.view addSubview:imageButton];
    [self.view addSubview:imageButton2];
}

- (void)buttonClicked:(UIButton*)button
{
    //NSLog(@"Button clicked! %@", button);

    UIImage *checkmarkImage = [UIImage imageNamed:@"check.png"];
    UIImage *empty = nil;

    //NSLog(@"Imageview: %d", button.imageView.tag);
    if (button.imageView.tag == 0)
    {
        [button setImage:checkmarkImage forState:UIControlStateNormal];
        button.imageView.tag = 1;
    }
    else
    {
        [button setImage:empty forState:UIControlStateNormal];
        button.imageView.tag = 0;
    }
}

Best, Chris

最好的，克里斯

Update: I have updated the code. Here is the entire ViewController. Note: I would solve this using coreData to store the current index. The following code is not the best to solve this issue but is based on your initial code!

更新：我已经更新了代码。这是整个 ViewController。注意：我会使用 coreData 来存储当前索引来解决这个问题。以下代码不是解决此问题的最佳方式，而是基于您的初始代码！

//
//  SOViewController.m
//  SOImageOverlay
//
//  Created by Chris on 24.07.12.
//

#import "SOViewController.h"

@interface SOViewController ()

@end


#define CHECKMARK_IMAGE @"check.png"

@implementation SOViewController

@synthesize buttons = _buttons;

#pragma mark - Custom getter
- (NSMutableArray*)buttons
{
    if (_buttons == nil)
        _buttons = [[NSMutableArray alloc] init];

    return _buttons;
}


#pragma mark - View lifecycle
- (void)viewDidLoad
{
    [super viewDidLoad];

//    UIImage *bgImage = [UIImage imageNamed:CHECKMARK_IMAGE];
//    UIButton *myButton = 
//    [myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
//    [myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
    // Create view
//    UIScrollView *view = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0f,0.0f,1024.0f,768.0f)];

    int row = 0;
    int column = 0;
    for(int i = 0; i < 2; ++i) {

        /*UIImage *thumb = [_thumbs objectAtIndex:i];
        myButton = [UIButton buttonWithType:UIButtonTypeCustom];
        myButton.frame = CGRectMake(column*140+24, row*150+10, 100, 100);
        [myButton setImage:thumb forState:UIControlStateNormal];
        [myButton addTarget:self 
                     action:@selector(buttonClicked:) 
           forControlEvents:UIControlEventTouchUpInside];
        myButton.tag = i; 
        NSLog(@"%i",i);*/

        UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
        if (i == 0)
        {
            UIImage *btnImage = [UIImage imageNamed:@"DSC_5359.JPG"];
            imageButton.frame = CGRectMake(30, 50, 100, 80);
            [imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
        }
        else if (i == 1)
         {
             UIImage *btnImage = [UIImage imageNamed:@"DSC_5355.JPG"];
             imageButton.frame = CGRectMake(180, 50, 100, 80);
             [imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
         }

        [imageButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];

        NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
        NSInteger selectedImageSlot1 = [prefs integerForKey:@"selected1"];

        if ( selectedImageSlot1 == i){
            [self turnButtonToSelected:imageButton];
        } 

        [self.view addSubview:imageButton];

        //adding current button into buttons array
        [self.buttons addObject:imageButton];

        if (column == 6) {
            column = 0;
            row++;
        } else {
            column++;
        }

    }

    //[view setContentSize:CGSizeMake(1024, (row+1) * 150 + 10)];


//    //button 1
//    UIButton *imageButton = [UIButton buttonWithType:UIButtonTypeCustom];
//    imageButton.frame = CGRectMake(30, 50, 100, 80);
//    UIImage *btnImage = [UIImage imageNamed:@"DSC_5359.JPG"];
//    [imageButton setBackgroundImage:btnImage forState:UIControlStateNormal];
//    [imageButton addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
//    
//    //button 2
//    UIButton *imageButton2 = [UIButton buttonWithType:UIButtonTypeCustom];
//    imageButton2.frame = CGRectMake(180, 50, 100, 80);
//    UIImage *btnImage2 = [UIImage imageNamed:@"DSC_5355.JPG"];
//    [imageButton2 setBackgroundImage:btnImage2 forState:UIControlStateNormal];
//    [imageButton2 addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchDown];
//
//    [self.view addSubview:imageButton];
//    [self.view addSubview:imageButton2];
}

//- (void)buttonClicked:(UIButton*)button
//{
//    //NSLog(@"Button clicked! %@", button);
//    
//    UIImage *checkmarkImage = [UIImage imageNamed:@"check.png"];
//    UIImage *empty = nil;
//    
//    //NSLog(@"Imageview: %d", button.imageView.tag);
//    if (button.imageView.tag == 0)
//    {
//        [button setImage:checkmarkImage forState:UIControlStateNormal];
//        button.imageView.tag = 1;
//    }
//    else
//    {
//        [button setImage:empty forState:UIControlStateNormal];
//        button.imageView.tag = 0;
//    }
//}



// code from stackoverflow
// ------------------------------------------------------------
- (void)turnButtonToSelected:(UIButton*)button
{       
    UIImage *bgImage = [UIImage imageNamed:CHECKMARK_IMAGE];

    //UIButton *myButton = button; //just to use the copied code
    button.selected = YES;
    [button setImage:bgImage forState:UIControlStateSelected];


//    [myButton setBackgroundImage:bgImage forState:UIControlStateNormal];
//    [myButton setBackgroundImage:bgImage forState:UIControlStateHighlighted];
//    [myButton setBackgroundImage:bgImage forState:UIControlStateDisabled];
//    [myButton setEnabled:NO];
}
- (void)highlightButton:(UIButton *)a {
    //[self turnButtonToSelected];    
}

- (IBAction)buttonClicked:(id)sender 
{
    UIButton *myButton = (UIButton *)sender;
    //I have removed this line... due to the fact that I don't want to 
    //implement your arrays.
    //self.selectedImage = [_images objectAtIndex:myButton.tag];

    //deselecting all
    for (UIButton *button in self.buttons)
    {
        button.selected = NO;
        //[button setImage:nil forState:UIControlStateNormal];
    }

    if (myButton.selected) {

        [sender setSelected:NO];

    }else {

        UIImage *bgImage = [UIImage imageNamed:CHECKMARK_IMAGE];
        [sender setImage:bgImage forState:UIControlStateSelected];
        [sender setSelected:YES];
    }


//    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
//    [prefs setInteger:myButton.tag forKey:@"slot1"];


    //getting index of button in array
    NSInteger index = 0;
    NSInteger foundIndex = -1;
    for (UIButton *button in self.buttons)
    {
        if (button == myButton)
        {
            foundIndex = index;
        }
        index++;
    }

    if (foundIndex >= 0)
    {
        [[NSUserDefaults standardUserDefaults] setInteger:foundIndex forKey:@"selected1"];
        [[NSUserDefaults standardUserDefaults] synchronize];
    }

    [self performSelector:@selector(highlightButton:) withObject:sender afterDelay:0.0];
   // [self dismissModalViewControllerAnimated:NO];

}
// ------------------------------------------------------------


- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}



- (IBAction)closeButtonClicked:(UIBarButtonItem *)sender 
{
    [self dismissModalViewControllerAnimated:YES];
}
@end

回答by Srikanth

Try doing this.

尝试这样做。

UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
**[myButton setSelected:NO];
[myButton setBackgroundImage:bgImage forState:UIControlStateNormal];**


UIImage *bgImage = [UIImage imageNamed:@"AGIPC-Checkmark-iPhone.png"];
**[myButton setSelected:YES];
[myButton setImage:bgImage forState:UIControlStateSelected];**

In the later part of code, you are setting the state of the button to "selected" but in the upper code, you haven't. Rather, you have disabled the button. Try the above code which I have provided. Thanks.

在代码的后面部分，您将按钮的状态设置为“已选择”，但在上面的代码中，您没有。相反，您已禁用该按钮。试试我提供的上面的代码。谢谢。

回答by Kunal Balani

Just add you chekedImage as a subview on top of the button when user clicks the button

只需在用户单击按钮时将 chekedImage 添加为按钮顶部的子视图

UIImage *button = [UIImage imageNamed:@"cat.png"];
[myButton setBackgroundImage:bgImage forState:UIControlStateNormal];
//add target button clicked 


-(void)buttonClicked : (id)sender{
    if(toogleSwitch){
       [button addSubview:checkedimageView]; // Just the checked image icon
    }
    else{
       [imageview removeFromSuperview];
    }
}

What you are trying to do will only work when you have resources of two types for all your images. 1) The image itself 2) Image with checked box as transparent layer.

只有当您的所有图像都拥有两种类型的资源时，您正在尝试做的事情才会起作用。1) 图像本身 2) 带有复选框的图像作为透明层。