iOS学习笔记02-UIScrollView iOS学习笔记02-UIScrollView

父类UIView方法

# autoresizingMask - 现在基本弃用，改用autoLayout typedef NS_OPTIONS(NSUInteger, UIViewAutoresizing) { UIViewAutoresizingNone= 0,//不进行自动调整 UIViewAutoresizingFlexibleLeftMargin= 1 << 0, //自动调整与superview左侧距离，右侧距离保持不变 UIViewAutoresizingFlexibleWidth= 1 << 1, //自动调整控件自身宽度，保证与superview左右距离不变 UIViewAutoresizingFlexibleRightMargin= 1 << 2, //自动调整与superview右侧距离，左侧距离保持不变 UIViewAutoresizingFlexibleTopMargin= 1 << 3, //自动调整与superview顶部距离，底部距离保持不变 UIViewAutoresizingFlexibleHeight= 1 << 4, //自动调整控件自身高度，保证与superview上下距离不变 UIViewAutoresizingFlexibleBottomMargin = 1 << 5//自动调整与superview底部距离，顶部距离保持不变 }; # transform - 形变属性【结构体 - 不能直接赋值】 // 绝对位置 CGAffineTransformMakeRotation(CGFloat angle); //旋转 CGAffineTransformMakeScale(CGFloat sx, CGFloat sy); //缩放 CGAffineTransformMakeTranslation(CGFloat tx, CGFloat ty); //移动 // 增量修改 CGAffineTransformRotation(CGAffineTransform t, CGFloat angle); //旋转 CGAffineTransformScale(CGAffineTransform t, CGFloat sx, CGFloat sy); //缩放 CGAffineTransformTranslation(CGAffineTransform t, CGFloat tx, CGFloat ty); //移动

UIScrollView中容易混淆的属性

contentSize 内容尺寸
contentInset 内容边框尺寸
【iOS学习笔记02-UIScrollView】contentOffset 可视框偏移

文章图片
contentSize、contentInset、contentOffset的区别

UIScrollViewDelegate代理方法

# 滚动时会调用，任何方式触发contentOffset变化都会调用，调用频率高 - (void)scrollViewDidScroll:(UIScrollView *)scrollView; # 开始拖拽时调用 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView; # 停止拖拽时调用 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView withDecelerate:(BOOL)decelarate; # 即将停止滚动时调用（拖拽松开后开始减速时调用） - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView; # 滚动停止时调用，特殊情况：当一次减速动画尚未结束的时候再次拖拽，didEndDecelerating不会被调用 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView; # 开始缩放时调用 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view; # 停止缩放时调用 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale; # 正在缩放时调用 - (void)scrollViewDidZoom:(UIScrollView *)scrollView;

UIScrollView基本用法

scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)]; scrollView.backgroundColor = [UIColor redColor]; // 是否支持滑动最顶端 scrollView.scrollsToTop = NO; scrollView.delegate = self; // 设置内容大小、内容边框、可视偏移 scrollView.contentSize = CGSizeMake(320, 460*10); scrollView.contentInset = UIEdgeInsetsMake(0, 50, 50, 0); # 这里好奇怪，number用任何数字代替，整个code就不会代码高亮了，估计是markdown的一个缺陷 scrollView.contentOffset = CGPointMake( number , number); // 是否反弹 scrollView.bounces = NO; // 是否分页 scrollView.pagingEnabled = YES; // 是否滚动 scrollView.scrollEnabled = NO; // 设置滚动条风格 scrollView.indicatorStyle = UIScrollViewIndicatorStyleWhite; // 设置滚动条边缘 scrollView.scrollIndicatorInsets = UIEdgeInsetsMake(0, 50, 0, 0); // 控制是否显示水平方向的滚动条 scrollView.showsHorizontalScrollIndicator = NO; // 控制是否显示垂直方向的滚动条 scrollView.showsVerticalScrollIndicator = YES; // 设置scrollView缩放的范围 scrollView.maximumZoomScale = 2.0; // 最大2倍 scrollView.minimumZoomScale = 0.5; // 是否同时运动,lock scrollView.directionalLockEnabled = YES; [self.view addSubview:scrollView];