IOS Uiscrollview Proxy method

Last Update:2016-10-14 Source: Internet

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Methods && properties:Monitor the current scrolling position (default Cgpointzero)<pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">CGPoint contentOffset; - (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated;</code></pre></pre>The size of the scrolling range (default Cgsizezero)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">CGSize contentSize; </code></pre></pre>Position of the view in ScrollView (uiedgeinsetszero)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">UIEdgeInsets contentInset; </code></pre></pre>Set up protocols<pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">id<UIScrollViewDelegate> delegate;</code></pre></pre>Specifies whether the control can scroll only in one Direction (default is No)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL directionalLockEnabled; </code></pre></pre>Controls whether the control encounters a bounce (default = yes)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL bounces; </code></pre></pre>Controls whether a border is bouncing vertically (default is no, if Yes,bounces is yes)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL alwaysBounceVertical; </code></pre></pre>Controls whether the border is bouncing horizontally (default is no, if Yes,bounces is yes)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL alwaysBounceHorizontal;</code></pre></pre>Controls whether the control is full-page flip (default is No)<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL pagingEnabled; </code></pre></pre>Controls whether controls can scroll<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL scrollEnabled;</code></pre></pre>Controls whether to display scroll bars in the horizontal direction<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL showsHorizontalScrollIndicator; </code></pre></pre>Controls whether to display scroll bars in a vertical direction<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">BOOL showsVerticalScrollIndicator;</code></pre></pre>Specify the position of the scrollbar in Scrollerview<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">UIEdgeInsets scrollIndicatorInsets; </code></pre></pre>Set the style of the scroll bar<pre class="hljs nginx"><pre class="hljs nginx"><code class="c">UIScrollViewIndicatorStyle indicatorStyle; </code></pre></pre>Uiscrollviewdelegate Detailed<pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ The method is called when The/scrollview is Scrolled. This method is called by any change in the value of Offset. That is, called multiple times during Scrolling-(void) scrollviewdidscroll: (uiscrollview *) Scrollview{nslog (@ "scrollviewdidscroll"); cgpoint point=scrollview.contentoffset; nslog (@ "%f,%f", point.x,point .y); //from which you can read the Contentoffset property to determine where it is scrolled to. //note: When the Contentsize attribute is less than the frame, it will not be set to scroll} </code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /when ScrollView is scaled, the method is Called. Call back multiple times during Scaling-(void) scrollviewdidzoom: (uiscrollview *) Scrollview{nslog (@ "scrollviewdidscroll"); float value=scrollview.zoomscale; nslog (@ "%f", value);} </code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /when You start scrolling the view, the method is Executed. An effective slide (start sliding, slide A short distance, as long as the finger does not release, only one slide), only one Time. -(void) scrollviewwillbegindragging: (UIScrollView *) Scrollview{nslog (@ "scrollviewwillbegindragging");} </code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">// 滑动scrollView，并且手指离开时执行。一次有效滑动，只执行一次。// 当pagingEnabled属性为YES时，不调用，该方法- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset{ NSLog(@"scrollViewWillEndDragging");}</code></pre></pre><pre class="hljs objectivec"><code class="c">Slide the view, call the method when the finger leaves the screen that Moment. A valid slide, executed only once.//decelerate, Referring to whether the view will continue to scroll forward (some distance) after our fingers leave that moment, tested, decelerate=yes-(void) scrollviewdidenddragging: (uiscrollview *) ScrollView Willdecelerate: (bool) decelerate{NSLog ( @ "scrollviewdidenddragging"); if (decelerate) {nslog (@ " Decelerate "); }else{nslog (@ "no decelerate");} cgpoint point=scrollview.contentoffset; nslog (@"%f,%f ", point.x,point.y); </code></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /slide deceleration when the method is Called. -(void) scrollviewwillbegindecelerating: (UIScrollView *) Scrollview{nslog (@ "scrollviewwillbegindecelerating"); Span class= "hljs-comment" >//the method after the scrollviewdidenddragging method. }</code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /scrolling view deceleration is complete, the method is called when scrolling stops. A valid slide, executed only once. -(void) scrollviewdidenddecelerating: (UIScrollView *) Scrollview{nslog (@ "scrollviewdidenddecelerating"); [_scrollview setcontentoffset:cgpointmake (0, 500) animated:yes];} </code><code class="c"> </code> </pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /when The scrolling view animation is complete, call the method, and if there is no animation, then the method will not be Called-(void) scrollviewdidendscrollinganimation: (uiscrollview *) scrollview{nslog (@ " Scrollviewdidendscrollinganimation "); //effective Animation method is: //-(void) setcontentoffset: (cgpoint) Contentoffset animated: (BOOL) Animated method //-(void) scrollrecttovisible: (cgrect) rect Animated: (BOOL) animated method} </code> </pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /returns the UIView object that will be Scaled. To execute multiple times-(uiview *) viewforzoominginscrollview: ( Uiscrollview *) scrollview{nslog (@ " Viewforzoominginscrollview "); return self.imgView;} </code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ /when you are about to start scaling, execute the Method. Once a valid scaling is Performed. -(void) scrollviewwillbeginzooming: (UIScrollView *) ScrollView withview: (uiview *) view{nslog (@" scrollviewwillbeginzooming ")} </code> </pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">/ The method is called when the zoom is finished, and the scaling is small back to Minimumzoomscale and Maximumzoomscale (we may go beyond the zoom range). -(void) scrollviewdidendzooming: (UIScrollView *) ScrollView withview: (uiview *) view atscale: (float) scale{ Span class= "hljs-built_in" >nslog (@ "scrollviewdidendzooming");} </code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">// 指示当用户点击状态栏后，滚动视图是否能够滚动到顶部。需要设置滚动视图的属性：_scrollView.scrollsToTop=YES;- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView{ return YES;}</code></pre></pre><pre class="hljs objectivec"><pre class="hljs objectivec"><code class="c">// 当滚动视图滚动到最顶端后，执行该方法- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView{ NSLog(@"scrollViewDidScrollToTop");}</code></pre></pre>Tip: Determine if the Uiscrollview is scrolling up or down<pre class="hljs objectivec"><code class="c">int _lastposition; //a variable define in Headfile-(void) scrollviewdidscroll: ( Span class= "hljs-built_in" >uiscrollview *) scrollview{int currentpostion = scrollView.contentoffset.y; if (currentpostion-_lastposition > 25) {_lastPosition = currentpostion; nslog (@ "scrollup now");} else if (_lastposition-currentpostion > 25) {_lastposition = currentpostion; nslog (@ "scrolldown now");}} //25 can be any number, can be set according to their own needs. </code></pre><pre class="hljs objectivec"><code class="c">Upgrade: does not bounce when reaching the top or bottom-(Void) Scrollviewdidscroll: (Uiscrollview *) scrollview{int currentpostion = ScrollView. contentoffset.y; if (currentpostion-_lastposition > 20 && Currentpostion > 0) {//this place plus currentpostion > 0) _ Lastposition = currentpostion; nslog (@ "scrollup now");} else if (_lastposition-currentpostion > 20" && (currentpostion <= scrollview.contentsize.height-scrollview.bounds.size.height-20)) {_lastposition = currentpostion; nslog (@" scrolldown now ")}} </code></pre><code class="c"> </code>IOS Uiscrollview Proxy method

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IOS Uiscrollview Proxy method

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