我想要在点击按钮时，设置默认<em>图片</em>高亮显示。按钮代码如下，在执行这段代码时，怎么设置另一个UIImage高亮？
- (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;
}
UIViewContentModeScaleToFill,
UIViewContentModeScaleAspectFit, // contents scaled to fit with fixed aspect. remainder is transparent
UIViewContentModeScaleAspectFill, // contents scaled to fill with fixed aspect. some portion of content ma
设置 UIImageView 的contentMode属性，根据自己的需要选择下面
UIViewContentModeScaleToFill,
UIViewContentModeScaleAspectFit, // contents scaled to fit with fixed aspect. remainder is transparent
两种方式
1.重写View的onMeasure方法参考这里easion_zms的专栏
核心代码protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec){
Drawable d = getDrawable(); if(d!=null){
// ce
