给你的APP添加手势

<p>看见别人做的APP有的时候加了很多手势,使得用户体验很好,让我非常羡慕,于是搜了一下,发现其实一点都不难,下面说一下简单的手势知识:</p>
<blockquote>
<ul>
<li>iOS将常用的触摸操作封装成了几个手势,手势识别器</li>
<li>手势识别器自带判断是否成立的功能,我们只需要去使用就可以了</li>
<li>使用手势需要三步:1.创建识别器对象;2.绑定识别器对象;3.实现识别器对象的方法</li>
</ul>
</blockquote>
<p>我们创建一个根视图控制体RootViewController,对应的View为RootView(rv),在上面建立一个imageView,我们在这个imageView上面进行手势操作。
首先打开imageView的用户响应,因为imageView的用户响应默认是关闭的。</p>
<figure class="highlight objectivec"><table><tr><td class="gutter"><pre><span class="line">1</span>
</pre></td><td class="code"><pre><span class="line"><span class="keyword">self</span><span class="variable">.rv</span><span class="variable">.imageView</span><span class="variable">.userInteractionEnabled</span> = <span class="literal">YES</span>;</span>
</pre></td></tr></table></figure>
<h3 id="u8F7B_u62CD_u624B_u52BF"><a href="#u8F7B_u62CD_u624B_u52BF" class="headerlink" title="轻拍手势"></a>轻拍手势</h3><figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
</pre></td><td class="code"><pre><span class="line">UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]<span class="string">initWithTarget:</span>self <span class="string">action:</span><span class="annotation">@selector</span>(<span class="string">tapAction:</span>)];</span>
<span class="line">[self.rv.imageView <span class="string">addGestureRecognizer:</span>tap];</span>
</pre></td></tr></table></figure>
<p>响应事件:</p>
<figure class="highlight erlang"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
<span class="line">3</span>
<span class="line">4</span>
</pre></td><td class="code"><pre><span class="line"><span class="pp">- <span class="params">(void)</span>tapAction:<span class="params">(<span class="variable">UITapGestureRecognizer</span> *)</span>sender</span>
<span class="line">{</span>
<span class="line"> NSLog<span class="params">(@<span class="string">"不要拍我"</span>)</span>;</span>
<span class="line">}</span></span>
</pre></td></tr></table></figure>
<h3 id="u957F_u6309_u624B_u52BF"><a href="#u957F_u6309_u624B_u52BF" class="headerlink" title="长按手势"></a>长按手势</h3><figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
<span class="line">3</span>
<span class="line">4</span>
</pre></td><td class="code"><pre><span class="line">UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]<span class="string">initWithTarget:</span>self <span class="string">action:</span><span class="annotation">@selector</span>(<span class="string">longAction:</span>)];</span>
<span class="line">[self.rv.imageView <span class="string">addGestureRecognizer:</span>longPress];</span>
<span class="line"><span class="comment">// 设置长按手势的判断时间为0.5秒</span></span>
<span class="line">longPress.minimumPressDuration = <span class="number">0.5</span>;</span>
</pre></td></tr></table></figure>
<p>响应事件:</p>
<figure class="highlight pf"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
<span class="line">3</span>
<span class="line">4</span>
<span class="line">5</span>
<span class="line">6</span>
<span class="line">7</span>
<span class="line">8</span>
<span class="line">9</span>
<span class="line">10</span>
</pre></td><td class="code"><pre><span class="line">- (void)longAction:(UILongPressGestureRecognizer *)sender</span>
<span class="line">{</span>
<span class="line"> // 长按手势有状态(<span class="keyword">state</span>),开始和结束</span>
<span class="line"> if (sender.<span class="keyword">state</span> == UIGestureRecognizerStateBegan) {</span>
<span class="line"> NSLog(@<span class="string">"长按开始"</span>);</span>
<span class="line"> }</span>
<span class="line"> if (sender.<span class="keyword">state</span> == UIGestureRecognizerStateEnded) {</span>
<span class="line"> NSLog(@<span class="string">"不要走!决战到天亮"</span>);</span>
<span class="line"> }</span>
<span class="line">}</span>
</pre></td></tr></table></figure>
<h3 id="u65CB_u8F6C_u624B_u52BF"><a href="#u65CB_u8F6C_u624B_u52BF" class="headerlink" title="旋转手势"></a>旋转手势</h3><figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
</pre></td><td class="code"><pre><span class="line">UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]<span class="string">initWithTarget:</span>self <span class="string">action:</span><span class="annotation">@selector</span>(<span class="string">rotationAction:</span>)];</span>
<span class="line">[self.rv.imageView <span class="string">addGestureRecognizer:</span>rotation];</span>
</pre></td></tr></table></figure>
<p>响应事件:</p>
<figure class="highlight objectivec"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
<span class="line">3</span>
<span class="line">4</span>
<span class="line">5</span>
<span class="line">6</span>
<span class="line">7</span>
</pre></td><td class="code"><pre><span class="line">- (<span class="keyword">void</span>)rotationAction:(<span class="built_in">UIRotationGestureRecognizer</span> *)sender</span>
<span class="line">{</span>
<span class="line"> <span class="comment">// imageView跟随手指旋转</span></span>
<span class="line"> <span class="keyword">self</span><span class="variable">.rv</span><span class="variable">.imageView</span><span class="variable">.transform</span> = <span class="built_in">CGAffineTransformRotate</span>(<span class="keyword">self</span><span class="variable">.rv</span><span class="variable">.imageView</span><span class="variable">.transform</span>, sender<span class="variable">.rotation</span>);</span>
<span class="line"> <span class="comment">// 将角度置零</span></span>
<span class="line"> sender<span class="variable">.rotation</span> = <span class="number">0</span>;</span>
<span class="line">}</span>
</pre></td></tr></table></figure>
<h3 id="u634F_u5408_uFF08_u7F29_u653E_uFF09_u624B_u52BF"><a href="#u634F_u5408_uFF08_u7F29_u653E_uFF09_u624B_u52BF" class="headerlink" title="捏合(缩放)手势"></a>捏合(缩放)手势</h3><figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
</pre></td><td class="code"><pre><span class="line">UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]<span class="string">initWithTarget:</span>self <span class="string">action:</span><span class="annotation">@selector</span>(<span class="string">pinchAction:</span>)];</span>
<span class="line">[self.rv.imageView <span class="string">addGestureRecognizer:</span>pinch];</span>
</pre></td></tr></table></figure>
<p>响应事件:</p>
<figure class="highlight processing"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
<span class="line">3</span>
<span class="line">4</span>
<span class="line">5</span>
<span class="line">6</span>
<span class="line">7</span>
</pre></td><td class="code"><pre><span class="line">- (<span class="keyword">void</span>)pinchAction:(UIPinchGestureRecognizer *)sender</span>
<span class="line">{</span>
<span class="line"> <span class="comment">// 控件跟随手指的捏合进行放大和缩小</span></span>
<span class="line"> sender.view.transform = CGAffineTransformScale(sender.view.transform, sender.<span class="built_in">scale</span>, sender.<span class="built_in">scale</span>);</span>
<span class="line"> <span class="comment">// 将放大缩小的倍数置为1</span></span>
<span class="line"> sender.<span class="built_in">scale</span> = <span class="number">1</span>;</span>
<span class="line">}</span>
</pre></td></tr></table></figure>
<h3 id="u5E73_u79FB_uFF08_u62D6_u52A8_uFF09_u624B_u52BF"><a href="#u5E73_u79FB_uFF08_u62D6_u52A8_uFF09_u624B_u52BF" class="headerlink" title="平移(拖动)手势"></a>平移(拖动)手势</h3><figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
</pre></td><td class="code"><pre><span class="line">UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]<span class="string">initWithTarget:</span>self <span class="string">action:</span><span class="annotation">@selector</span>(<span class="string">panAction:</span>)];</span>
<span class="line">[self.rv.imageView <span class="string">addGestureRecognizer:</span>pan];</span>
</pre></td></tr></table></figure>
<p>响应事件:</p>
<figure class="highlight groovy"><table><tr><td class="gutter"><pre><span class="line">1</span>
<span class="line">2</span>
<span class="line">3</span>
<span class="line">4</span>
<span class="line">5</span>
<span class="line">6</span>
<span class="line">7</span>
<span class="line">8</span>
</pre></td><td class="code"><pre><span class="line">- (<span class="typename">void</span>)<span class="string">panAction:</span>(UIPanGestureRecognizer *)sender</span>
<span class="line">{</span>
<span class="line"> <span class="comment">// 控件跟随手指的移动而移动</span></span>
<span class="line"> CGPoint point = [sender <span class="string">translationInView:</span>sender.view];</span>
<span class="line"> sender.view.transform = CGAffineTransformTranslate(sender.view.transform, point.x, point.y);</span>
<span class="line"> <span class="comment">// 将偏移量归零</span></span>
<span class="line"> [sender <span class="string">setTranslation:</span>CGPointZero <span class="string">inView:</span>sender.view];</span>
<span class="line">}</span>
</pre></td></tr></table></figure>
<p>好了,手势的学习就到这里,抓紧练习去提升自己APP的bigger吧!</p>

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