去掉导航栏的边界黑线
方法1：
[self.navigationController.navigationBar setBackgroundImage:[[UIImage alloc] init] forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [[UIImage alloc] init];
方法2：
if ([self.navigationController.navigationBar respondsToSelector:@selector( setBackgroundImage:forBarMetrics:)]){
NSArray *list=self.navigationController.navigationBar.subviews;
for (id obj in list) {
if ([obj isKindOfClass:[UIImageView class]]) {
UIImageView *imageView=(UIImageView *)obj;
NSArray *list2=imageView.subviews;
for (id obj2 in list2) {
if ([obj2 isKindOfClass:[UIImageView class]]) {
UIImageView *imageView2=(UIImageView *)obj2;
imageView2.hidden=YES;
}
}
}
}
}
去掉搜索框的边界黑线
代码：
[self.textSearchBar setBackgroundImage:[[UIImage alloc] init]];
Stroryboard：
选中搜索框——右边in attribute inspector——View 在Tint的颜色栏中选择 clear color
