方法1.協(xié)議和代理
在UIView中設(shè)置協(xié)議和代理屬性
#import <UIKit/UIKit.h>
@protocol RootViewDelegate<NSObject>
- (void)changeColor:(UIView *)view;
@end
@interface RootView : UIView
@property (nonatomic, assign) id<RootViewDelegate> delegate;
@end
讓UIViewController遵守協(xié)議并實(shí)現(xiàn)協(xié)議中的中的方法
#import "RootViewController.h"
#import "RootView.h"
@interface RootViewController ()<RootViewDelegate>
@end
@implementation RootViewController
- (void)changeColor:(UIView *)view{
view.backgroundColor = [UIColor redColor];
}
- (void)viewDidLoad {
[super viewDidLoad];
RootView *rootView = [[RootView alloc] initWithFrame:CGRectMake(100,100,100,100)];
rootView.background = [UIColor whiteColor];
rootView.delegate = self;
[self.view addSubview:rootView];
[rootView release];
@end
在UIView中調(diào)用協(xié)議方法
@implementation RootView
- (void)touchesBegin:(NSSet <NSTouch *> *)touches withEvent:(UIEvent *)event{
if ([self.delegate respondsToSelector:@selector(changeColor)]) {
[self.delegate changeColor:self];
}
}
@end
方法2.模擬UIControl的addTarget方法
在UIView的.h文件中設(shè)置聲明addTarget方法，并在.m中實(shí)現(xiàn)和調(diào)用方法
@interface RootView : NSObject
{
id _target;
SEL _action;
}
- (void)addTarget:(id)target action:(SEL)action;
@end
@implementation RootView
- (void)addTarget:(id)target action:(SEL)action{
_target = target;
_action = action;
}
- (void)touchesBegin:(NSSet <NSTouch *> *)touches withEvent:(UIEvent *)event{
[_target performSelector:_action withObject:self];
}
@end
在UIViewController中調(diào)用addTarget方法
#import "RootView.h"
@implementation RootViewController
- (void)viewDidLoad{
[super viewDidLoad];
RootView *rootVC = [[RootView alloc] initWithFrame:CGRectMake(100,200,300,400)];
[rootVC addTarget:self action:@selector(rootVCAction:)];
[self.view addSubview:rootVC];
[rootVC release];
}
- (void)rootVCAction:(UIView *)view{
view.backgroundColor = [UIColor redColor];
}
@end
