第iOStableView實(shí)現(xiàn)頭部拉伸并改變導(dǎo)航條漸變色@property(nonatomic,strong)UIImageView*headImage;

@property(nonatomic,strong)UIView*headerBackView;

@property(nonatomic,strong)UIView*mengView;

@implementationTableViewController

-(void)viewDidLoad{

[superviewDidLoad];

[self.tableViewregisterClass:[UITableViewCellclass]forCellReuseIdentifier:ident];

self.view.backgroundColor=[UIColorredColor];

self.tableView.tableHeaderView=self.headerBackView;

[self.headerBackViewaddSubview:self.headImage];

[self.headImageaddSubview:self.mengView];

[selfnavCleanFromAlpha:0];

-(void)navCleanFromAlpha:(CGFloat)alpha

[self.navigationController.navigationBarsetBackgroundImage:[selfcreateImageWithColor:ZhuTiColorAlpha(alpha)]forBarMetrics:UIBarMetricsDefault];

self.navigationController.navigationBar.shadowImage=[UIImagenew];

-(UIImage*)createImageWithColor:(UIColor*)color

CGRectrect=CGRectMake(0.0f,0.0f,1.0f,1.0f);

UIGraphicsBeginImageContext(rect.size);

CGContextRefcontext=UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context,[colorCGColor]);

CGContextFillRect(context,rect);

UIImage*theImage=UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

returntheImage;

-(UIImageView*)headImage

if(!_headImage)

_headImage=[[UIImageViewalloc]initWithFrame:self.headerBackView.bounds];

_headImage.image=[UIImageimageNamed:@1024

return_headImage;

-(UIView*)mengView

if(!_mengView)

_mengView=[[UIViewalloc]initWithFrame:self.headerBackView.bounds];

_mengView.backgroundColor=RGBA(1,1,1,0.1);

return_mengView;

-(UIView*)headerBackView

if(!_headerBackView)

_headerBackView=[[UIViewalloc]initWithFrame:CGRectMake(0,0,ScreenWidth,imageHight)];

[_headerBackViewsetBackgroundColor:[UIColorlightGrayColor]];

return_headerBackView;

-(void)didReceiveMemoryWarning{

[superdidReceiveMemoryWarning];

//Disposeofanyresourcesthatcanberecreated.

-(void)scrollViewDidScroll:(UIScrollView*)scrollView

//----------------------圖片拉升-------------------------

//圖片高度

CGFloatimageHeight=self.headerBackView.frame.size.height;

//圖片寬度

CGFloatimageWidth=ScreenWidth;

//圖片上下偏移量

CGFloatimageOffsetY=scrollView.contentOffset.y;

//NSLog(@圖片上下偏移量imageOffsetY:%f-,imageOffsetY);

//上移

if(imageOffsetY0)

CGFloattotalOffset=imageHeight+ABS(imageOffsetY);

CGFloatf=totalOffset/imageHeight;

self.headImage.frame=CGRectMake(-(imageWidth*f-imageWidth)*0.5,imageOffsetY,imageWidth*f,totalOffset);

self.mengView.frame=self.headImage.bounds;

//-------------------導(dǎo)航條顏色漸變----------------------------

CGFloattableViewOffsetY=[self.tableViewrectForSection:0].origin.y-NAVIGATION_BAR_HEIGHT;

CGFloatcontentOffsetY=scrollView.contentOffset.y;

if(contentOffsetY=tableViewOffsetY)

//scrollView.contentOffset=CGPointMake(0,tableViewOffsetY);//定位

[selfnavCleanFromAlpha:1];

else

CGFloatalpha=scro