iOS开发：多个按钮点击滑动效果

<span style="font-size:24px;">#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIButton *btn1;
@property (weak, nonatomic) IBOutlet UIButton *btn2;
@property (weak, nonatomic) IBOutlet UIButton *btn3;
@property (weak, nonatomic) IBOutlet UIButton *btn4;
@property (weak, nonatomic) IBOutlet UIButton *ben5;
@property (weak, nonatomic) IBOutlet UIView *redRect;
@property (nonatomic) BOOL btnState;//监听按钮状态
@property (nonatomic, strong) UIButton *linstenBtn;//监听者

@end</span>

<span style="font-size:24px;">@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
_btn1.selected = YES;
_linstenBtn = _btn1;
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - 点击事件
- (IBAction)clickBtn:(UIButton *)sender {
_linstenBtn.selected = NO;
sender.selected = YES;
//改变红块的位置
CGRect btnFrame = sender.frame;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.2];
self.redRect.frame = CGRectMake(btnFrame.origin.x, self.redRect.frame.origin.y, sender.frame.size.width, sender.frame.size.height);
[UIView commitAnimations];
//监听状态
_linstenBtn = sender;
}

@end</span>