將UIImage設置為在按下另一個UIButton時突出顯示

Question

我想將默認的UIImage更改為在按下UIButton時突出顯示。 因此，當執行以下代碼時，我想將另一個的UIImage更改為突出顯示。

- (IBAction)buttonOperationPressed:(id)sender {
    if (currentOperation == 0) result = currentNumber;
    else {
        switch (currentOperation) {
            case 1:
                result = result + currentNumber;
                break;
            case 2:
                result = result - currentNumber;
                break;
            case 3:
                result = result * currentNumber;
                break;
            case 4:
                result = result / currentNumber;
                break;
            case 5:
                currentOperation = 0;
                break;
        }
    }
        currentNumber = 0;
        calculatorScreen.text = [NSString stringWithFormat:@"%g", result];
        if ([sender tag] ==0) result=0;
        currentOperation = [sender tag];
        userInTheMiddleOfEnteringDecimal = NO;
  }

Answer 1

UIImage沒有突出顯示狀態（請查看文檔： http : //developer.apple.com/library/ios/#documentation/UIKit/Reference/UIImage_Class/Reference/Reference.html ）

Answer 2

我假設您具有要高亮顯示的imageView的引用

- (IBAction)buttonOperationPressed:(id)sender{
    UIImageView *imageView = [UIImageView alloc] init];
    imageView.frame = CGRectMake(0,0,200,200);  //Change frame according to your Need
    NSString *path = [[NSBundle mainBundle] pathForResource:@"highlighted_image" ofType:@"png"];
    UIImage *image = [[UIImage alloc] initWithContentsOfFile:path];
    imageView.image = image;
    }

您必須在資源中添加圖像。