UIBarButtonItem 左边间隙过大，解决方案(ios11之前)：
调用下面的方法，设置negativeSpacer.width = -15;就可以解决间隙过大的问题：
UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithCustomView:dayOrWeekButton];
self.navigationItem.leftBarButtonItem = leftItem;
[dayOrWeekButton release];
[leftItem release];
if ([[[[UIDevice currentDevice] systemVersion] substringToIndex:1] intValue]>=7)
{
UIBarButtonItem *negativeSpacer = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
negativeSpacer.width = -15;
self.navigationItem.leftBarButtonItems = @[negativeSpacer, leftItem];
}else{
self.navigationItem.leftBarButtonItem = leftItem;
}但是ios11以后，导航栏返回按钮偏移20像素，这个时候，上述方法就不行了，但是在之前是可以的，思路是这样的：写一个基类，在基类里面是把系统的导航给设置了下，并声明了几个方法，然后其他的控制器可以直接继承调用，当然也可以直接用一个view来自定义，这样也可以解决！
具体代码如下，判断系统版本号是为了更好的适配所以的机型（因为有好多人不喜欢升级系统）：
//左侧按钮
-(void)addLeftBarButtonWithImg:(UIImage *)image
{
UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];
leftBtn.frame = CGRectMake(0, 0, 60, 44);
[leftBtn setImage:image forState:UIControlStateNormal];
[leftBtn addTarget:self action:@selector(leftseaexitAction) forControlEvents:UIControlEventTouchUpInside];
if (GetVesion == 11.0) {
leftBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[leftBtn setImageEdgeInsets:UIEdgeInsetsMake(0, -20, 0, 0)];
UIBarButtonItem *leftBarBtnItem = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];
self.navigationItem.leftBarButtonItem = leftBarBtnItem;
}else
{
UIBarButtonItem *leftBarBtnItem = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];
self.navigationItem.leftBarButtonItem = leftBarBtnItem;
}
}//右侧按钮
-(void)addRightBarButtonWithImg:(UIImage *)image r_hidden:(BOOL)r_hidden
{
_rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
_rightButton.frame = CGRectMake(0, 0, 60, 44);
_rightButton.hidden = r_hidden;
// _rightButton.backgroundColor = [UIColor grayColor];
[_rightButton setImage:image forState:UIControlStateNormal];
[_rightButton addTarget:self action:@selector(clickRightBtn:) forControlEvents:UIControlEventTouchUpInside];
if (GetVesion == 11.0) {
_rightButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
[_rightButton setImageEdgeInsets:UIEdgeInsetsMake(0, 0, 0, -20)];
UIBarButtonItem *rightBarBtn = [[UIBarButtonItem alloc]initWithCustomView:_rightButton];
self.navigationItem.rightBarButtonItem = rightBarBtn;
}else
{
UIBarButtonItem *rightBarBtnItem = [[UIBarButtonItem alloc]initWithCustomView:_rightButton];
self.navigationItem.leftBarButtonItem = rightBarBtnItem;
}
}//右侧为文字item的情况
- (void)addRightBarButtonItemWithTitle:(NSString *)itemTitle action:(SEL)action
{
UIButton *rightbBarButton = [[UIButtonalloc]initWithFrame:CGRectMake(0,0,88,44)];
[rightbBarButton setTitle:itemTitle forState:(UIControlStateNormal)];
[rightbBarButton setTitleColor:kDarkOneColorforState:(UIControlStateNormal)];
rightbBarButton.titleLabel.font = [UIFontsystemFontOfSize:14];
[rightbBarButton addTarget:selfaction:actionforControlEvents:(UIControlEventTouchUpInside)];
if (GetVesion == 11.0) {
rightbBarButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;
[rightbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0,0,0, -20)];
} else
{
//这里适配以前的版本写老方法就可以
}
self.navigationItem.rightBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:rightbBarButton];
}//左侧为文字item的情况
- (void)addLeftBarButtonItemWithTitle:(NSString *)itemTitle action:(SEL)action
{
UIButton *leftbBarButton = [[UIButtonalloc]initWithFrame:CGRectMake(0,0,44,44)];
[leftbBarButton setTitle:itemTitleforState:(UIControlStateNormal)];
[leftbBarButton setTitleColor:kDarkOneColorforState:(UIControlStateNormal)];
leftbBarButton.titleLabel.font = [UIFontsystemFontOfSize:16];
[leftbBarButton addTarget:selfaction:actionforControlEvents:(UIControlEventTouchUpInside)];
if (GetVesion == 11.0) {
leftbBarButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentLeft;
[leftbBarButton setTitleEdgeInsets:UIEdgeInsetsMake(0, -5 *kScreenWidth/375.0,0,0)];
} else
{
//这里适配以前的版本写老方法就可以
}
self.navigationItem.leftBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:leftbBarButton]; }//右侧两个图片item的情况
- (void)addRightTwoBarButtonsWithFirstImage:(UIImage *)firstImage firstAction:(SEL)firstAction secondImage:(UIImage *)secondImage secondAction:(SEL)secondAction
{
UIView *view = [[UIViewalloc]initWithFrame:CGRectMake(0,0,80,44)];
view.backgroundColor = [UIColorclearColor];
UIButton *firstButton = [UIButtonbuttonWithType:UIButtonTypeCustom];
firstButton.frame = CGRectMake(44, 6, 30, 30);
[firstButton setImage:firstImageforState:UIControlStateNormal];
[firstButton addTarget:selfaction:firstActionforControlEvents:UIControlEventTouchUpInside];
if (GetVesion == 11.0) {
firstButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;
[firstButton setImageEdgeInsets:UIEdgeInsetsMake(0,0,0, -5 * kScreenWidth/375.0)];
} else
{
//这里适配以前的版本写老方法就可以
}
[view addSubview:firstButton];
UIButton *secondButton = [UIButtonbuttonWithType:UIButtonTypeCustom];
secondButton.frame = CGRectMake(6, 6, 30, 30);
[secondButton setImage:secondImageforState:UIControlStateNormal];
[secondButton addTarget:selfaction:secondActionforControlEvents:UIControlEventTouchUpInside];
if (GetVesion == 11.0) {
secondButton.contentHorizontalAlignment =UIControlContentHorizontalAlignmentRight;
[secondButton setImageEdgeInsets:UIEdgeInsetsMake(0,0,0, -5 * kScreenWidth/375.0)];
}
[view addSubview:secondButton];
UIBarButtonItem *rightBarButtonItem = [[UIBarButtonItemalloc]initWithCustomView:view];
self.navigationItem.rightBarButtonItem = rightBarButtonItem;
}备注：千万别忘了，适配ios11之前的系统，最后在上面的if方法里面要适配以前的版本！
然后在控制器里面，直接 [self 方法]调用即可，如果坐标不合适可以自行处理，如果你的需求是三个四个item按钮，可以仿照上边两个item按钮的方法，自行处理。
作者：稻草人11223
