如何通过颜色选择器方法在按钮上设置颜色？

Question

我在 for 循环中生成了一些按钮，每个按钮都有自己的标签。现在我想点击一个按钮并打开一个颜色选择器并设置按钮的颜色。

我的问题是，当我打开颜色选择器并选择一种颜色时，它会设置在不同的按钮上。我想点击一个按钮并只为点击的按钮选择颜色。

我使用的代码是：

for(int i=0;i<=5;i++){ 
    btnphoto=[[UIButton alloc]initWithFrame:CGRectMake(10,(30*i)+110,50,20)];    
    [btnphoto setTitle:@"Photo" forState:UIControlStateNormal];     
    [btnphoto setBackgroundColor:[UIColor redColor]]; 
    [btnphoto addTarget:self action:@selector(buttonPressPickColor:)
               forControlEvents:UIControlEventTouchUpInside];  
    btnphoto.tag=100 + i;
    [self.view addSubview:btnphoto];
}

-(IBAction)buttonPressPickColor:(UIButton*)sender
{   
    btnphoto.tag = sender.tag;
    NSLog(@"Btn photo Tag = %d",sender.tag);
    NEOColorPickerViewController *controller = [[NEOColorPickerViewController alloc] init];
    controller.delegate = self;
    controller.selectedColor = self.currentColor;
    controller.title = @"Color Picker";
    UINavigationController* navVC = [[UINavigationController alloc]initWithRootViewController:controller]; 
    [self presentViewController:navVC animated:YES completion:nil];
}

-(void)colorPickerViewController:(NEOColorPickerBaseViewController *)controller didSelectColor:(UIColor *)color 
{
    btnphoto.backgroundColor = color;  /// Important Line
    [controller dismissViewControllerAnimated:YES completion:nil];
}

Answer 1

最简单的方法是拥有一个实例变量/属性并将您选择的按钮的标签设置为它并使用该标签来获取正确的按钮实例......

例如：

在接口文件中：

@property (nonatomic, weak) int selectedTag;

以下是修改后的代码，可以进一步帮助您

-(IBAction)buttonPressPickColor:(UIButton*)sender{   
_selectedTag = sender.tag;
NSLog(@"Btn photo Tag = %d",sender.tag);
NEOColorPickerViewController *controller = [[NEOColorPickerViewController alloc] init];
controller.delegate = self;
controller.selectedColor = self.currentColor;
controller.title = @"Color Picker";
UINavigationController* navVC = [[UINavigationController alloc]initWithRootViewController:controller]; 
[self presentViewController:navVC animated:YES completion:nil]; 
}
-(void)colorPickerViewController:(NEOColorPickerBaseViewController *)controller didSelectColor:(UIColor *)color {
UIButton *selectedButton = (UIbutton *)[self.view viewWithTag:_selectedTag];
selectedButton.backgroundColor = color;  /// Important Line
[controller dismissViewControllerAnimated:YES completion:nil]; }

希望这会有所帮助...