【移動(dòng)應(yīng)用開發(fā)技術(shù)】IOS UIScrollView 詳解

【移動(dòng)應(yīng)用開發(fā)技術(shù)】IOSUIScrollView詳解

//觸摸屏幕來滾動(dòng)畫面還是其他的方法使得畫面滾動(dòng)，皆觸發(fā)該函數(shù)-(void)scrollViewDidScroll:(UIScrollView*)scrollView{

NSLog(@"Scrolling...");}//觸摸屏幕并拖拽畫面，再松開，最后停止時(shí)，觸發(fā)該函數(shù)-(void)scrollViewDidEndDragging:(UIScrollView*)scrollViewwillDecelerate:(BOOL)decelerate{

NSLog(@"scrollViewDidEndDragging

-

EndofScrolling.");}//滾動(dòng)停止時(shí)，觸發(fā)該函數(shù)-(void)scrollViewDidEndDecelerating:(UIScrollView*)scrollView{

NSLog(@"scrollViewDidEndDecelerating

-

EndofScrolling.");}//調(diào)用以下函數(shù)，來自動(dòng)滾動(dòng)到想要的位置，此過程中設(shè)置有動(dòng)畫效果，停止時(shí)，觸發(fā)該函數(shù)//

UIScrollView的setContentOffset:animated:

//

UIScrollView的scrollRectToVisible:animated://UITableView的scrollToRowAtIndexPath:atScrollPosition:animated://UITableView的selectRowAtIndexPath:animated:scrollPosition:-(void)scrollViewDidEndScrollingAnimation:(UIScrollView*)scrollView{

NSLog(@"scrollViewDidEndScrollingAnimation

-

EndofScrolling.");}首先實(shí)現(xiàn)UIScrollViewDelegate協(xié)議：[plain]

viewplaincopy#import

<UIKit/UIKit.h>

@interface

Activity01ViewController

:

UIViewController<UIScrollViewDelegate>{

UIScrollView

*myscrollview;

}

@property

(nonatomic,retain)

UIScrollView

*myscrollview;

@end

對(duì)myscrollview進(jìn)行初始化：[plain]

viewplaincopy-

(void)viewDidLoad

{

[super

viewDidLoad];

//

Do

any

additional

setup

after

loading

the

view,

typically

from

a

nib.

myscrollview

=

[[UIScrollView

alloc]

initWithFrame:CGRectMake(0.0,

44,768,

1004)];

myscrollview.directionalLockEnabled

=

YES;

//只能一個(gè)方向滑動(dòng)

myscrollview.pagingEnabled

=

NO;

//是否翻頁

myscrollview.backgroundColor

=

[UIColor

blackColor];

myscrollview.showsVerticalScrollIndicator

=YES;

//垂直方向的滾動(dòng)指示

myscrollview.indicatorStyle

=

UIScrollViewIndicatorStyleWhite;//滾動(dòng)指示的風(fēng)格

myscrollview.showsHorizontalScrollIndicator

=

NO;//水平方向的滾動(dòng)指示

myscrollview.delegate

=

self;

CGSize

newSize

=

CGSizeMake(self.view.frame.size.width,

self.view.frame.size.height+1);

[myscrollview

setContentSize:newSize];

float

x=0;

float

y=0;

float

width

=768;

float

height

=

1004;

UIImageView

*myp_w_picpath

=

[[UIImageView

alloc]

initWithImage:[UIImage

p_w_picpathNamed:@"Activity01.png"]];

//[myp_w_picpath

setContentMode:UIViewContentModeScaleAspectFill];

[myp_w_picpath

setFrame:CGRectMake(x,

y,

width,

height)];

[myscrollview

addSubview:myp_w_picpath];

[self.view

addSubview:myscrollview];

}

屬性總結(jié)：屬性

作用CGPointcontentOffSet

監(jiān)控目前滾動(dòng)的位置CGSizecontentSize

滾動(dòng)范圍的大小UIEdgeInsetscontentInset

視圖在scrollView中的位置id<UIScrollerViewDelegate>delegate

設(shè)置協(xié)議BOOLdirectionalLockEnabled指定控件是否只能在一個(gè)方向上滾動(dòng)BOOLbounces

控制控件遇到邊框是否反彈BOOLalwaysBounceVertical

控制垂直方向遇到邊框是否反彈BOOLalwaysBounceHorizontal控制水平方向遇到邊框是否反彈BOOLpagingEnabled

控制控件是否整頁翻動(dòng)BOOLscrollEnabled

控制控件是否能滾動(dòng)BOOLshowsHorizontalScrollIndicator控制是否顯示水平方向的滾動(dòng)條BOOLshowsVerticalScrollIndicator控制是否顯示垂直方向的滾動(dòng)條UIEdgeInsetsscrollIndicatorInsets指定滾動(dòng)條在scrollerView中的位置UIScrollViewIndicatorStyleindicatorStyle設(shè)定滾動(dòng)條的樣式floatdecelerationRate

改變scrollerView的減速點(diǎn)位置BOOLtracking

監(jiān)控當(dāng)前目標(biāo)是否正在被跟蹤BOOLdragging

監(jiān)控當(dāng)前目標(biāo)是否正在被拖拽BOOLdecelerating

監(jiān)控當(dāng)前目標(biāo)是否正在減速BOOLdelaysContentTouches

控制視圖是否延時(shí)調(diào)用開始滾動(dòng)的方法BOOLcanCancelContentTouches

控制控件是否接觸取消touch的事件floatminimumZoomScale

縮小的最小比例floatmaximumZoomScale

放大的最大比例floatzoomScale

設(shè)置變化比例BOOLbouncesZoom

控制縮放的時(shí)候是否會(huì)反彈BOOLzooming

判斷控件的大小是否正在改變BOOLzoomBouncing

判斷是否正在進(jìn)行縮放反彈BOOLscrollsToTop

控制控件滾動(dòng)到頂部注意：1、使scrollview不要上下滑動(dòng)，可以設(shè)置scrollview.contentSize=

CGSizeMake(你要的長(zhǎng)度,0);

協(xié)議方法解釋：[plain]

viewplaincopy#pragma

mark

UIScrollViewDelegate

//只要滾動(dòng)了就會(huì)觸發(fā)

-

(void)scrollViewDidScroll:(UIScrollView

*)scrollView;

{

//

NSLog(@"

scrollViewDidScroll");

NSLog(@"ContentOffset

x

is

%f,yis

%f",scrollView.contentOffset.x,scrollView.contentOffset.y);

}

//開始拖拽視圖

-

(void)scrollViewWillBeginDragging:(UIScrollView

*)scrollView;

{

NSLog(@"scrollViewWillBeginDragging");

}

//完成拖拽

-

(void)scrollViewDidEndDragging:(UIScrollView

*)scrollView

willDecelerate:(BOOL)decelerate;

{

NSLog(@"scrollViewDidEndDragging");

}

//將開始降速時(shí)

-

(void)scrollViewWillBeginDecelerating:(UIScrollView

*)scrollView;

{

NSLog(@"scrollViewWillBeginDecelerating");

}

//減速停止了時(shí)執(zhí)行，手觸摸時(shí)執(zhí)行執(zhí)行

-

(void)scrollViewDidEndDecelerating:(UIScrollView

*)scrollView;

{

NSLog(@"scrollViewDidEndDecelerating");

}

//滾動(dòng)動(dòng)畫停止時(shí)執(zhí)行,代碼改變時(shí)出發(fā),也就是setContentOffset改變時(shí)

-

(void)scrollViewDidEndScrollingAnimation:(UIScrollView

*)scrollView;

{

NSLog(@"scrollViewDidEndScrollingAnimation");

}

//設(shè)置放大縮小的視圖，要是uiscrollview的subview

-

(UIView

*)viewForZoomingInScrollView:(UIScrollView

*)scrollView;

{

NSLog(@"viewForZoomingInScrollView");

return

viewA;

}

//完成放大縮小時(shí)調(diào)用

-

(void)scrollViewDidEndZooming:(UIScrollView

*)scrollView

withView:(UIView

*)view

atScale:(float)scale;

{

viewA.frame=CGRectMake(50,0,100,400);

NSLog(@"scale

between

minimum

and

maximum.

called

after

any

'bounce'

animations");

}//

scale

between

minimum

and

maximum.

called

after

any

'bounce'

animations

//如果你不是完全滾動(dòng)到滾軸視圖的頂部，你可以輕點(diǎn)狀態(tài)欄，那個(gè)可視的滾軸視圖會(huì)一直滾