横向模式下UINavigationBar的自定义背景

@interface CustomNavigationBar : UINavigationBar

@end

@implementation CustomNavigationBar

- (void)drawRect:(CGRect)rect {
    // 在这里绘制自定义背景
}

@end

CustomNavigationBar *navigationBar = [[CustomNavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)];
[self.view addSubview:navigationBar];

- (void)drawRect:(CGRect)rect {
    CGContextRef context = UIGraphicsGetCurrentContext();
    // 在这里绘制自定义背景
}

- (void)drawRect:(CGRect)rect {
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
    CGContextFillRect(context, rect);
}

CustomNavigationBar *navigationBar = [[CustomNavigationBar alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, 44)];
navigationBar.barTintColor = nil;
[self.view addSubview:navigationBar];