在NSArray中声明全局变量

Question

我想实现一个功能，当我点击"operatorButton"的titleColor改变，但当我点击其他按钮除了"operatorButton"， "operatorButton"的titleColor回到原色。

这里我有一个问题:我在"viewDidLoad"方法中声明的"operatorButton"是局部变量，我不能在其他方法中访问。我如何声明"operatorButton"作为一个全局变量，代表每一个项目在NSArray"operationButton"?

#import <UIKit/UIKit.h>
@property (strong, nonatomic) IBOutletCollection(UIButton) NSArray *operationButton;    

- (void)viewDidLoad {
[super viewDidLoad];
for (UIButton *operatorButton  in  self.operationButton){
    [operatorButton setTitleColor:[UIColor colorWithRed:248.0/255 green:148.0/255 blue:52.0/255 alpha:1.0]
                         forState:UIControlStateSelected];
    [operatorButton setTitleColor: [UIColor colorWithRed:95.0/255 green:105.0/255 blue:114.0/255 alpha:1.0]
                         forState:UIControlStateNormal];
}
}

Answer 1

您已经使用IBOutletCollection将其声明为数组。你可以访问self。因为它是一个属性。

为所有按钮创建一个IBAction，然后尝试以下操作:

-(IBAction)selectedButton:(id)sender
{
  UIButton *senderButton = (UIButton *)sender;
  for (UIButton *operatorButton in self.operationButton)
  {
    if ([operatorButton isEqualTo:senderButton])
    {
      //set title color to your selected Color
    }
    else
    {
      //set title color to original color on buttons not clicked
    }
  }
}