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使用自定义UIView替换UINavigationBar,在ViewDidLoad中setNavigationBarHidden:YES;
自定义UIView的实现–CustomNavView
CustomNavView.h
#import <UIKit/UIKit.h>
@interface CustomNavView : UIView
@property (weak, nonatomic) IBOutlet UILabel *titleLb;
@property (weak, nonatomic) IBOutlet UIImageView *bgImageView;
@property (nonatomic,strong) UIButton *leftBtn;
@property (nonatomic,strong) UIView *titleView;
@property (nonatomic,strong) NSArray *rightBtnArr;
-(void)hideNavWithAnimation:(BOOL)isAnimation;
-(void)showNavWithAnimation:(BOOL)isAnimation;
@end
这里对leftBtn只设置了一个,而rightBtn使用了数组,支持了多个Btn,可以根据自己项目的需求使leftBtn支持多个按钮。hide于show方法是为了支持项目中上滑隐藏于下滑显示的效果,同样可以用于navView的显示与隐藏。titleView与titleLb有点重复了。我在项目中使用了XIB,使用纯代码应该更好。
.m实现:
- (id)initWithFrame:(CGRect)frame{
self = [[[NSBundle mainBundle] loadNibNamed:@"CustomNavView" owner:self options:nil] objectAtIndex:0];
if (self) {
frame.size.height=IS_IOS_7?64:44;
self.frame=frame;
_rightBtnArr=[[NSArray alloc] init];
_leftBtn=[UIButton buttonWithType:UIButtonTypeCustom];
_titleView=[[UIView alloc] init];
}
return self;
}
-(void)layoutSubviews{
[super layoutSubviews];
self.frame=CGRectMake(0,0,320,(IS_IOS_7?64:44));
}
在layout中把view的frame重新设置回来,防止再初始化的时候大小设置失误(其实初始化的时候直接使用init方法就够了,而且layout方法会被一直调用)。
-(void)hideNavWithAnimation:(BOOL)isAnimation{
[UIView animateWithDuration:0.4 animations:^{
self.frame=CGRectMake(0,-44,320,(IS_IOS_7?:64:44));
self.titleView.alpha=0;
self.leftBtn.alpha=0;
[self hideRightBtns];
}];
}
-(void)showNavWithAnimation:(BOOL)isAnimation{
[UIView animateWithDuration:0.4 animations:^{
self.frame=CGRectMake(0,0,320,(IS_IOS_7?:64:44));
self.titleView.alpha=1;
self.leftBtn.alpha=1;
[self showRightBtns];
}];
}
用0.4秒的动画来hide与show。
-(void)hideRightBtns{
for (UIButton *btn in _rightBtnArr) {
btn.alpha=0;
}
}
-(void)showRightBtns{
for (UIButton *btn in _rightBtnArr) {
btn.alpha=1;
}
}
这里没有判断数组中是否真的是UIButton,不安全(- – 为什么我没有改,因为项目实在急着适配,又是一扇破窗……)
-(void)setRightBtnArr:(NSArray *)rightBtnArr{
if (_rightBtnArr.count>0) {
for (UIButton *btn in _rightBtnArr) {
[btn removeFromSuperview];
}
}
_rightBtnArr=rightBtnArr;
CGFloat xTag=0.0;
for (UIButton *btn in rightBtnArr) {
CGRect btnFrame=btn.frame;
btnFrame.origin.x=320-btn.frame.size.width-xTag;
if (IS_IOS_7) {
btnFrame.origin.y=(self.frame.size.height+20-_leftBtn.frame.size.height)/2;
}else{
btnFrame.origin.y=(self.frame.size.height-_leftBtn.frame.size.height)/2;
}
btn.frame=btnFrame;
[self addSubview:btn];
xTag=320-btnFrame.origin.x;
}
}
设置rightBtnArr的时候需要把原来的那些Btn从View上移除掉,不然就是各种叠加,然后再把新的Btn加上去。
-(void)setLeftBtn:(UIButton *)leftBtn{
_leftBtn=leftBtn;
CGRect btnFrame=_leftBtn.frame;
btnFrame.origin.x=0;
if (IS_IOS_7) {
btnFrame.origin.y=(self.frame.size.height+20-_leftBtn.frame.size.height)/2;
}else{
btnFrame.origin.y=(self.frame.size.height-_leftBtn.frame.size.height)/2;
}
_leftBtn.frame=btnFrame;
[self addSubview:_leftBtn];
}
-(void)setTitleView:(UIView *)titleView{
_titleView=titleView;
_titleView.center=CGPointMake(self.center.x, IS_IOS_7==YES?self.center.y+10:self.center.y);
[self addSubview:_titleView];
}
写在最后:这只是一种应急的适配方案,能够做到快速的进行适配,但是对于可扩展性、重用性与可维护性来说还是比较差的,打算再做一个自定义的UINavigationController这样用起来应该更加方便!