标签：
The methods declared by the UIScrollViewDelegate protocol allow the adopting delegate to respond to messages from the UIScrollView class and thus respond to, and in some affect, operations such as scrolling, zooming, deceleration of scrolled content, and scrolling animations.
通过UIScrollViewDelegate协议声明的方法允许采用的代表来响应来自UIScrollView类的信息，因此在某些情况下，响应像滚动，缩放，滚动内容的减速和滚动的动画等操作。
Tells the delegate when the user scrolls the content view within the receiver.
当用户滚动接收器内的内容视图时通知delegate。
SWIFT
optional func scrollViewDidScroll(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
scrollView |
The scroll-view object in which the scrolling occurred. 滚动发生的滚动视图对象。 |
The delegate typically implements this method to obtain the change in content offset from scrollView and draw the affected portion of the content view.
delegate典型实现这个方法从scrollView获取内容边际的变化和现实内容视图受影响的部分。
import UIKit
Available in iOS 2.0 and later.
Tells the delegate when the scroll view is about to start scrolling the content.
SWIFT
optional func scrollViewWillBeginDragging(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
scrollView |
The scroll-view object that is about to scroll the content view. |
The delegate might not receive this message until dragging has occurred over a small distance.
import UIKit
Available in iOS 2.0 and later.
Tells the delegate when the user finishes scrolling the content.
SWIFT
optional func scrollViewWillEndDragging(_ scrollView: UIScrollView,
withVelocity velocity: CGPoint,
targetContentOffset targetContentOffset: UnsafeMutablePointer<CGPoint>)
OBJECTIVE-C
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
scrollView |
The scroll-view object where the user ended the touch.. |
velocity |
The velocity of the scroll view (in points) at the moment the touch was released. |
targetContentOffset |
The expected offset when the scrolling action decelerates to a stop. |
This method is not called when the value of the scroll view’s pagingEnabled property is YES. Your application can change the value of the targetContentOffset parameter to adjust where the scrollview finishes its scrolling animation.
import UIKit
Available in iOS 5.0 and later.
Tells the delegate when dragging ended in the scroll view.
SWIFT
optional func scrollViewDidEndDragging(_ scrollView: UIScrollView,
willDecelerate decelerate: Bool)
OBJECTIVE-C
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
scrollView |
The scroll-view object that finished scrolling the content view. |
decelerate |
|
The scroll view sends this message when the user’s finger touches up after dragging content. The decelerating property of UIScrollView controls deceleration.
import UIKit
Available in iOS 2.0 and later.
Asks the delegate if the scroll view should scroll to the top of the content.
SWIFT
optional func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool
OBJECTIVE-C
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView
scrollView |
The scroll-view object requesting this information. |
YES to permit scrolling to the top of the content, NO to disallow it.
If the delegate doesn’t implement this method, YES is assumed. For the scroll-to-top gesture (a tap on the status bar) to be effective, the scrollsToTop property of the UIScrollView must be set to YES.
import UIKit
Available in iOS 2.0 and later.
Tells the delegate that the scroll view scrolled to the top of the content.
SWIFT
optional func scrollViewDidScrollToTop(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
scrollView |
The scroll-view object that perform the scrolling operation. |
The scroll view sends this message when it finishes scrolling to the top of the content. It might call it immediately if the top of the content is already shown. For the scroll-to-top gesture (a tap on the status bar) to be effective, the scrollsToTop property of the UIScrollView must be set to YES.
import UIKit
Available in iOS 2.0 and later.
Tells the delegate that the scroll view is starting to decelerate the scrolling movement.
SWIFT
optional func scrollViewWillBeginDecelerating(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
scrollView |
The scroll-view object that is decelerating the scrolling of the content view. |
The scroll view calls this method as the user’s finger touches up as it is moving during a scrolling operation; the scroll view will continue to move a short distance afterwards. The decelerating property of UIScrollView controls deceleration.
import UIKit
Available in iOS 2.0 and later.
Tells the delegate that the scroll view has ended decelerating the scrolling movement.
SWIFT
optional func scrollViewDidEndDecelerating(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
scrollView |
The scroll-view object that is decelerating the scrolling of the content view. |
The scroll view calls this method when the scrolling movement comes to a halt. The decelerating property of UIScrollView controls deceleration.
import UIKit
Available in iOS 2.0 and later.
Asks the delegate for the view to scale when zooming is about to occur in the scroll view.
SWIFT
optional func viewForZoomingInScrollView(_ scrollView: UIScrollView) -> UIView?
OBJECTIVE-C
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
scrollView |
The scroll-view object displaying the content view. |
A UIView object that will be scaled as a result of the zooming gesture. Return nil if you don’t want zooming to occur.
import UIKit
Available in iOS 2.0 and later.
Tells the delegate that zooming of the content in the scroll view is about to commence.
SWIFT
optional func scrollViewWillBeginZooming(_ scrollView: UIScrollView,
withView view: UIView!)
OBJECTIVE-C
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view
scrollView |
The scroll-view object displaying the content view. |
view |
The view object whose content is about to be zoomed. |
This method is called at the beginning of zoom gestures and in cases where a change in zoom level is to be animated. You can use this method to store state information or perform any additional actions prior to zooming the view’s content.
import UIKit
Available in iOS 3.2 and later.
Tells the delegate when zooming of the content in the scroll view completed.
SWIFT
optional func scrollViewDidEndZooming(_ scrollView: UIScrollView,
withView view: UIView!,
atScale scale: CGFloat)
OBJECTIVE-C
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale
scrollView |
The scroll-view object displaying the content view. |
view |
The view object representing that part of the content view that needs to be scaled. |
scale |
The scale factor to use for scaling; this value must be between the limits established by the |
The scroll view also calls this method after any “bounce” animations. It also calls this method after animated changes to the zoom level and after a zoom-related gesture ends (regardless of whether the gesture resulted in a change to the zoom level).
import UIKit
Available in iOS 2.0 and later.
Tells the delegate that the scroll view’s zoom factor changed.
SWIFT
optional func scrollViewDidZoom(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
scrollView |
The scroll-view object whose zoom factor changed. |
import UIKit
Available in iOS 3.2 and later.
Tells the delegate when a scrolling animation in the scroll view concludes.
SWIFT
optional func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView)
OBJECTIVE-C
- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView
scrollView |
The scroll-view object that is performing the scrolling animation. |
The scroll view calls this method at the end of its implementations of the setContentOffset:animated: and scrollRectToVisible:animated: methods, but only if animations are requested.
import UIKit
Available in iOS 2.0 and later.
标签：
原文地址：http://www.cnblogs.com/baaingSheep/p/4279560.html
