去掉Tabbar顶部线条

- (void)changeTabBar {

//不透明

self.tabBar.translucent=NO;

CGRectrect =CGRectMake(0,0,KScreenWidth,49);

UIGraphicsBeginImageContext(rect.size);

CGContextRefcontext =UIGraphicsGetCurrentContext();

CGContextSetFillColorWithColor(context, [[UIColorclearColor]CGColor]);

CGContextFillRect(context, rect);

UIImage*img =UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

[self.tabBa rsetBackgroundImage:img];

[self.tabBar setShadowImage:img];

}

原理：其实并没有删除横线，只是把它变成透明了。