實現 scrollview 預設顯示指定的頁碼

思路：用scrollview的偏移量來實現

以下**執行成功

#import

@inte***ce mainviewcontroller : uiviewcontroller
@property (nonatomic,retain) iboutlet uiscrollview *scrollview0;
@property (nonatomic,retain) iboutlet uipagecontrol *pagecontrol0;
@property bool isloadscrollview0; 
- (ibaction)changepage:(id
)sender;
@end

#import

"mainviewcontroller.h
"static nsuinteger fnumberofpages = 4
;@inte***ce
mainviewcontroller (privatemethods)
- (void)loadscrollviewwithpage:(int
)page;
- (void)scrollviewdidscroll:(uiscrollview *)sender;
@end
@implementation
mainviewcontroller
@synthesize
scrollview0, pagecontrol0;
@synthesize
isloadscrollview0;
- (id)initwithnibname:(nsstring *)nibnameornil bundle:(nsbundle *)nibbundleornil
return
self;
}- (void
)viewdidload
//scrollview0 初始化
scrollview0.pagingenabled =yes;
scrollview0.contentsize = cgsizemake(scrollview0.frame.size.width *fnumberofpages, scrollview0.frame.size.height);
scrollview0.showshorizontalscrollindicator =no;
scrollview0.showsverticalscrollindicator =no;
scrollview0.scrollstotop =no;
scrollview0.
delegate =self;
scrollview0.tag = 1000
; 
pagecontrol0.numberofpages =fnumberofpages;
pagecontrol0.currentpage = 0; //
這個只改變了pagecontrol 被選中的位置
isloadscrollview0 =yes;
//使用如下3句** 實現預設顯示 scrollview 指定的頁
cgpoint pt = cgpointmake(640, 0
); 
[scrollview0 setcontentoffset:pt]; //設定scrollview 的偏移量
[self scrollviewdidscroll:scrollview0]; //模擬scrollview 被滑動
}- (void
)viewdidunload
- (ibaction)changepage:(id
)sender
}- (void)loadscrollviewwithpage:(int
)page
}- (void)scrollviewdidscroll:(uiscrollview *)sender
//switch the indicator when more than 50% of the previous/next page is visible
cgfloat pagewidth =scrollview0.frame.size.width;
nslog(
@"scrollview0.contentoffset.x === %f
",scrollview0.contentoffset.x );
int page = floor((scrollview0.contentoffset.x - pagewidth / 2) / pagewidth) + 1
; pagecontrol0.currentpage =page;
[self loadscrollviewwithpage:page - 1
]; [self loadscrollviewwithpage:page];
[self loadscrollviewwithpage:page + 1
]; }}//
at the begin of scroll dragging, reset the boolean used when scrolls originate from the uipagecontrol
- (void)scrollviewwillbegindragging:(uiscrollview *)scrollview}//
at the end of scroll animation, reset the boolean used when scrolls originate from the uipagecontrol
- (void)scrollviewdidenddecelerating:(uiscrollview *)scrollview
}-(bool)shouldautorotatetointe***ceorientation:(uiinte***ceorientation)inte***ceorientation
@end

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