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1，去除navigationbar 底部黑线 ——亲测可用
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;
}
}
}
}
}
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原文地址：http://www.cnblogs.com/developer-qin/p/ios.html
