Runtime动态添加属性

类别(Category)添加属性

.h文件

//添加属性
@property (nonatomic, assign) BOOL fd_prefersNavigationBarHidden;

.m文件实现

#import <objc/runtime.h>

//Get方法
- (BOOL)fd_prefersNavigationBarHidden
{
    return [objc_getAssociatedObject(self, _cmd) boolValue];
}
//Set方法
- (void)setFd_prefersNavigationBarHidden:(BOOL)hidden
{
    objc_setAssociatedObject(self, @selector(fd_prefersNavigationBarHidden), @(hidden), OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

UIViewController调用

#import "UINavigationController+FDFullscreenPopGesture.h"

self.fd_prefersNavigationBarHidden = YES;