如何在Objective-C中使用自定义委托

@protocol CustomDelegate <NSObject>
- (void)customDelegateMethod:(id)sender;
@end

@interface CustomClass : NSObject
@property (nonatomic, weak) id<CustomDelegate> delegate;
@end

- (IBAction)buttonClicked:(id)sender {
    if ([self.delegate respondsToSelector:@selector(customDelegateMethod:)]) {
        [self.delegate customDelegateMethod:sender];
    }
}

@interface ViewController : UIViewController<CustomDelegate>
@end

@implementation ViewController
- (void)customDelegateMethod:(id)sender {
    // 在这里实现您的代码
}
@end

CustomClass *customObject = [[CustomClass alloc] init];
customObject.delegate = self;