IOS_UIButton去掉系统的按下高亮置灰效果

第一种方法：

setAdjustsImageWhenHighlighted   // default is YES. if YES, image is drawn darker when highlighted(pressed)

UIButton *priceBtn = [UIButton buttonWithType:UIButtonTypeCustom];
[priceBtn setTag:PRICE_BTN_TAG];
[priceBtn setFrame:CGRectMake(DISTANCE_OF_SCREEN_BORDER, 3, 63, 31.5)];
[priceBtn setBackgroundColor:[UIColor clearColor]];
[priceBtn setImage:[UIImage imageNamed:@"sequence_up_pressed.png"] forState:UIControlStateNormal];
[priceBtn addTarget:self action:@selector(priceBtnClicked:) forControlEvents:UIControlEventTouchUpInside];
[priceBtn setAdjustsImageWhenHighlighted:NO];

相关属性：

@property(nonatomic)         BOOL         reversesTitleShadowWhenHighlighted;
 // default is NO. if YES, shadow reverses to shift between engrave and emboss appearance
@property(nonatomic)         BOOL         adjustsImageWhenHighlighted;   //
default is YES. if YES, image is drawn darker when highlighted(pressed)
@property(nonatomic)         BOOL         adjustsImageWhenDisabled;      //
default is YES. if YES, image is drawn lighter when disabled
@property(nonatomic)         BOOL         showsTouchWhenHighlighted;     //
default is NO. if YES, show a simple feedback (currently a glow) while highlighted

第二种方法：
本群的Misery-iOS-武汉提到了一个巧妙的方法  正常&高亮用相同的图片
[priceBtn setImage:[UIImage imageNamed:@"sequence_up_pressed.png"] forState:UIControlStateNormal];
[priceBtn setImage:[UIImage imageNamed:@"sequence_up_pressed.png"] forState:UIControlStateHighlighted];

欢迎其他同志们补充