ios - 我们如何在自定义 UIView 类中调用操作？需要在所有 View Controller 中重用 UIView 类

Question

我创建了一个自定义 UIView 类。每当调用 backButton 时，我都想调用一个 Action 。需要在所有 View Controller 中重用此 UIView 类以及操作。我可以在 UIView 类本身或 View Controller 中编写吗？

#import "CustomView.h"

@implementation CustomView

- (instancetype)init {

   if(self = [super init]){
    //-------------------custom headerView----------------
    self.headerView = [[UIView alloc]init];
    self.headerView.frame = CGRectMake(0, 0, SCREEN_WIDTH, 40);
    self.headerView.backgroundColor = [UIColor redColor];
    [self addSubview:self.headerView];

    self.backButton = [[UIButton alloc]initWithFrame:CGRectMake(5,13, 12, 16)];
    [self.backButton setImage:[UIImage imageNamed:@"back-btn.png"]
                     forState:UIControlStateNormal];
    [self.backButton addTarget:self
                        action:@selector(backButtonAction)
              forControlEvents:UIControlEventTouchUpInside];
    [self.headerView addSubview:self.backButton];
   }
   return self;
}

后退按钮 Action

-(void)backButtonAction{
   [[self navigationController] popViewControllerAnimated:YES];
}

Answer 1

这很简单
您必须为 UIViewController 创建类别喜欢 UIViewController+Additions

点击File -> New -> File

点击Objective-C file在 Sources 下在 iOS然后点击下一步

现在下 File Type:选择Category

然后设置文件名:Additions并设置类:UIViewController

UIViewController+Additions.h
首先在.h中创建你的后退按钮功能>>

-(void)addBackButton;

UIViewController+Additions.m

-(void)addBackButton
{
    self.navigationItem.leftBarButtonItem = nil;
    UIButton *aBtn = [UIButton buttonWithType:UIButtonTypeCustom];
   // [aBtn setTitle:@"Back" forState:UIControlStateNormal];
    [aBtn setImage:[UIImage imageNamed:@"back-btn.png"] forState:UIControlStateNormal];
    [aBtn setFrame:CGRectMake(0, 0,50, 64)];
    [aBtn.titleLabel setFont:[UIFont systemFontOfSize:18.0]];
    aBtn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
    aBtn.imageEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);
    aBtn.titleEdgeInsets = UIEdgeInsetsMake(0, 0, 0, 0);

    [aBtn setTitleColor:[UIColor colorWithRed:1/255.0 green:65/255.0 blue:96/255.0 alpha:1.0] forState:UIControlStateNormal];

        [aBtn addTarget:self action:@selector(backButtonAction) forControlEvents:UIControlEventTouchUpInside];

    UIBarButtonItem *aBarBtn = [[UIBarButtonItem alloc]initWithCustomView:aBtn];
    self.navigationItem.leftBarButtonItem = aBarBtn;
}

-(void)backButtonAction
{
    [self.navigationController popViewControllerAnimated:YES];
}

像这样使用:

只需在任何 View Controller 类中导入类别 #import "UIViewController+Additions.h"

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
     [self addBackButton];
}