iOS学习笔记02-UIScrollView

父类UIView方法

// autoresizingMask - 如今基本弃用，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
• contentOffset 可视框偏移
  

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; // 中止拖拽时调用 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView withDecelerate:(BOOL)decelarate; // 即将中止滚动时调用（拖拽松开后开始减速时调用） - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView; // 滚动中止时调用，特殊状况：当一次减速动画还没有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; // 中止缩放时调用 - (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); scrollView.contentOffset = CGPointMake( 50 , 50 ); // 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];