Objective-C实现自定义的半透明导航

#define kScreenWidth [[UIScreen mainScreen] bounds].size.width#define kScreenHeight [[UIScreen mainScreen] bounds].size.height #import "RSwenNav.h" @implementation RSwenNav{ UIVisualEffectView *effectview;}-(instancetype)initWithFrame:(CGRect)frame{ self=[super initWithFrame:frame]; if (self) {  UIBlurEffect *blur = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight]; effectview = [[UIVisualEffectView alloc] initWithEffect:blur]; effectview.frame=frame; [self addSubview:effectview]; [self addSubviews]; } return self;} //添加导航子视图-(void)addSubviews{ [self addSubview:self.backBtn]; [self addSubview:self.titleLabel]; [self addSubview:self.rightBtn]; }-(UIButton *)backBtn{ UIButton * btn=[UIButton buttonWithType:UIButtonTypeCustom]; btn.frame=CGRectMake(20, 20, 60, 44); [btn setTitle:@"返回" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(RSwenNavback) forControlEvents:UIControlEventTouchUpInside]; return btn;} -(UILabel *)titleLabel{ UILabel * lable=[[UILabel alloc]init]; lable.font=[UIFont systemFontOfSize:17]; lable.textAlignment=NSTextAlignmentCenter; lable.frame=CGRectMake(100, 20, kScreenWidth-200, 44); lable.text=@"我的主页"; return lable;} -(UIButton *)rightBtn{ UIButton * btn=[UIButton buttonWithType:UIButtonTypeCustom]; btn.frame=CGRectMake([UIScreen mainScreen].bounds.size.width-100, 20, 80, 44); [btn setTitle:@"保存" forState:UIControlStateNormal]; [btn addTarget:self action:@selector(rightBtnClicked) forControlEvents:UIControlEventTouchUpInside]; return btn;} #pragma 事件处理部分 //返回上个界面-(void)RSwenNavback{ //获取UIView的上层UIViewController id object = [self nextResponder]; while (![object isKindOfClass:[UIViewController class]] &&    object != nil) {   object = [object nextResponder];   } UIViewController *uc=(UIViewController*)object;  [uc.navigationController popViewControllerAnimated:YES];} //右侧按钮被点击-(void)rightBtnClicked{ if ([_delegate respondsToSelector:@selector(RSwenNavrightBtnClicked)]) { [_delegate RSwenNavrightBtnClicked]; }} @end