在UIButton上长按手势识别器? [英] Long press gesture recognizer on UIButton?
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问题描述
我正在开发Minesweeper游戏,我想在用户长按游戏板的图块时添加标志. 我已经实现了这段代码:
I'm working on the Minesweeper game, I want to add the flag when user long tap on a tile of the gameboard. I've implemented this code:
对于游戏板上的每个按钮:
For every button in gameboard:
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressTap:)];
longPress.minimumPressDuration = 1.0f;
[self.button addGestureRecognizer:longPress];
在自身中,方法 longPressTap:
- (void)longPressTap:(Tile *)sender {
if (sender.block.marking == MARKING_FLAGGED) {
// if already a flag I mark as a blank tile, with color defined for gameboard
sender.backgroundColor = UIColorFromRGB(0x067AB5);
sender.block.marking = MARKING_BLANK;
self.flagCount++;
}
else{
// if it's not a flag I mark as a flag and set the flag image for the tile
[sender setBackgroundImage:[UIImage imageNamed:IMAGE_NAME_FLAG] forState:UIControlStateNormal];
sender.block.marking = MARKING_FLAGGED;
self.flagCount--;
}
}
当然,自我是我的 UIGestureRecognizerDelegate . 但是,当我尝试长按磁贴时,应用程序崩溃并出现以下错误:
And of course self is my UIGestureRecognizerDelegate. But when I try to long press on a tile, the app crash and give this error:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UILongPressGestureRecognizer block]: unrecognized selector sent to instance 0x8cf2b00'
我该怎么办?我刚开始使用Obj-C编程,所以如果有人可以帮助我并解释我做错了什么,我将非常感激.
What should I do? I'm at the very beginning with Obj-C programming so if someone can help me and explain what I did wrong I'll be very grateful.
推荐答案
- (void)showOptions:(UILongPressGestureRecognizer*)sender{
UIButton *btn = (UIButton*)sender.view;
NSLog(@"view tag %d",sender.view.tag);
if (sender.state == UIGestureRecognizerStateEnded)
{
}
else if (sender.state == UIGestureRecognizerStateBegan)
{
[self.bubbleDelegate showOptionsForMessage:btn];
}
}
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