我的客户昨天说,“我想要点击它时突出显示”.没关系,它立即推动一个新的uinavigationcontroller视图……它没有眨眼,所以他很困惑. Oy公司.
这就是我为解决这个问题所做的工作.我不喜欢它,但这就是我所做的：
我将UIButton(将其命名为FlashingUIButton)进行了子类化.
出于某种原因,我无法在控制模式下突出显示背景图像.它似乎永远不会达到“突出”的状态.不知道为什么会这样.
所以我写道：
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self setBackgroundImage:[UIImage imageNamed:@"grey_screen"] forState:UIControlStateNormal];
[self performSelector:@selector(resetImage) withObject:nil afterDelay:0.2];
[super touchesBegan:touches withEvent:event];
}
-(void)resetImage
{
[self setBackgroundImage:nil forState:UIControlStateNormal];
}
这快乐地将我的grey_screen.png(一个30％不透明的黑盒子)放在按钮上,当它被点击时,用一个快乐的空虚替换它.2秒后.
这很好,但这意味着我必须通过我的所有笔尖并将我的所有按钮从UIButtons更改为FlashingUIButtons.这不是世界末日,但我真的希望将其作为UIButton类别来解决,并且一举击中所有鸟类.
有没有比这更好的方法的建议？
//
// HighlighterGestureRecognizer.h
// Copyright 2011 PathwaySP. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface HighlightGestureRecognizer : UIGestureRecognizer {
id *beganButton;
}
@property(nonatomic, assign) id *beganButton;
@end
和实施：
//
// HighlightGestureRecognizer.m
// Copyright 2011 PathwaySP. All rights reserved.
//
#import "HighlightGestureRecognizer.h"
@implementation HighlightGestureRecognizer
@synthesize beganButton;
-(id) init{
if (self = [super init])
{
self.cancelsTouchesInView = NO;
}
return self;
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
self.beganButton = [[[event allTouches] anyObject] view];
if ([beganButton isKindOfClass: [UIButton class]]) {
[beganButton setBackgroundImage:[UIImage imageNamed:@"grey_screen"] forState:UIControlStateNormal];
[self performSelector:@selector(resetImage) withObject:nil afterDelay:0.2];
}
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
}
- (void)reset
{
}
- (void)ignoreTouch:(UITouch *)touch forEvent:(UIEvent *)event
{
}
- (BOOL)canBePreventedByGestureRecognizer:(UIGestureRecognizer *)preventingGestureRecognizer
{
return NO;
}
- (BOOL)canPreventGestureRecognizer:(UIGestureRecognizer *)preventedGestureRecognizer
{
return NO;
}
- (void)resetImage
{
[beganButton setBackgroundImage: nil forState:UIControlStateNormal];
}
@end
嗯.我没有测试这段代码,所以如果它不起作用,不要起诉我,只是评论,我们会解决它.我只是快速写了它以供参考.即使它不起作用,逻辑应该仍然是合理的.
编辑：
忘记添加,你将手势识别器添加到按钮的方式如下：
HighlighterGestureRecognizer * tapHighlighter = [[HighlighterGestureRecognizer alloc] init]; [myButton addGestureRecognizer:tapHighlighter]; [tapHighlighter release];
所以基本上你要声明它,初始化它,然后添加它.之后,您将要释放它,因为addGestureRecognizer会保留它.