Button的外部类方法使用的运用情景：需要在A类里面的Button点击之后，需要在B类里面监听或执行某些操作的时候。具体代码如下：
首先创建一个BassViewController；
#import 〈UIKit/UIKit.h〉@interface BassViewController : UIViewController
+ (void)buttonAction;
@end
@implementation BassViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
// Do any additional setup after loading the view.
}
+ (void)buttonAction {
NSLog(@"Are you OK?");
}
然后再建一个FirstViewController 去创建Button
#import "FirstViewController.h"
@interface FirstViewController ()
@property (nonatomic, retain)UIButton *button;
@end
@implementation FirstViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
[self buttonAction:@selector(testAction)];
}
- (void)buttonAction:(SEL)button{
self.button = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
self.button.backgroundColor = [UIColor redColor];
self.button.showsTouchWhenHighlighted = YES;
[self.button addTarget:self action:button forControlEvents:6];
[self.view addSubview:self.button];
}
- (void)testAction{
[BassViewController buttonAction];
}
ps：这样就可以在BassViewController 中写点击Button 之后 BassViewController 的一些操作事宜，不需要监听之类的操作；
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