Objective C - 自定义视图和实现 init 方法

自定义视图是Objective C中常用的一种技术，它允许开发者根据自己的需求创建特定的视图组件。在实现自定义视图时，我们通常需要重写init方法来进行一些初始化操作。本文将介绍如何自定义视图并实现init方法，并且提供一个案例代码来帮助读者更好地理解。

objective-c
#import 
@interface CustomView : UIView
@property (nonatomic, strong) UILabel *titleLabel;
- (instancetype)initWithFrame:(CGRect)frame;
@end

objective-c
#import "CustomView.h"
@implementation CustomView
- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.titleLabel = [[UILabel alloc] initWithFrame:self.bounds];
        self.titleLabel.textAlignment = NSTextAlignmentCenter;
        self.titleLabel.textColor = [UIColor blackColor];
        [self addSubview:self.titleLabel];
    }
    return self;
}
@end

objective-c
#import "ViewController.h"
#import "CustomView.h"
@interface ViewController ()
@property (nonatomic, strong) CustomView *customView;
@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.customView = [[CustomView alloc] initWithFrame:CGRectMake(50, 100, 200, 50)];
    self.customView.titleLabel.text = @"Hello, Custom View!";
    [self.view addSubview:self.customView];
}
@end