遇到過這種需求要做成類似與蘋果刪除軟件時的動態效果。

1.長按抖動;
2.抖動時出現一個X;
3.點擊x，刪除button;
4.抖動時，點擊按鈕，停止抖動;

下面是我的設計思路：
1.繼承UIButton；
2.給button在右上角添加一個按鈕；
3.給button添加長按手勢；
4.給button添加遮蓋，抖動時可以攔截點擊事件；

有更好的做法，還請斧正。

// .m文件

#import "DZDeleteButton.h"
#import "UIView+Extension.h" // 這個只是為了方便取寬高的一個分類，代碼就不貼了

@interface DZDeleteButton ()

// 是否抖動
@property (nonatomic, assign, getter=isShaking) BOOL shaking;
// 右上角的按鈕，
@property (nonatomic, weak) UIImageView *iconBtn;
// 遮蓋，在抖動時出現
@property (nonatomic, weak) UIView *coverView;
@end

@implementation DZDeleteButton

- (UIImageView *)iconBtn {
  if (!_iconBtn) {
    UIImageView *iconBtn = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"delete"]];
    iconBtn.userInteractionEnabled = YES;
    iconBtn.hidden = YES;
    _iconBtn = iconBtn;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(iconClick)];
    [iconBtn addGestureRecognizer:tap];
    [self addSubview:iconBtn];
  }
  return _iconBtn;
}

- (UIView *)coverView {
  if (!_coverView) {
    UIView *view = [[UIView alloc] init];
    view.backgroundColor = [UIColor clearColor];
    view.hidden = YES;
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(coverClick)];
    [view addGestureRecognizer:tap];
    [self addSubview:view];
    _coverView = view;
  }
  return _coverView;
}

- (instancetype)initWithFrame:(CGRect)frame
{
  self = [super initWithFrame:frame];
  if (self) {
    [self addLongPressGestureRecognizer];
  }
  return self;
}

- (instancetype)init
{
  self = [super init];
  if (self) {
    [self addLongPressGestureRecognizer];
  }
  return self;
}

- (instancetype)initWithCoder:(NSCoder *)coder
{
  self = [super initWithCoder:coder];
  if (self) {
    [self addLongPressGestureRecognizer];
  }
  return self;
}

// 添加長按手勢
- (void)addLongPressGestureRecognizer {
  UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longClick)];
  [self addGestureRecognizer:longPress];
}

- (void)delete {
  [self.iconBtn.superview removeFromSuperview];
}

// 是否執行動畫
- (void)setShaking:(BOOL)shaking {
  if (shaking) {
    [self shakingAnimation];
    self.coverView.hidden = NO;
    self.iconBtn.hidden = NO;
  } else {
    [self.layer removeAllAnimations];
    self.coverView.hidden = YES;
    self.iconBtn.hidden = YES;
  }
}

#pragma mark - 抖動動畫
#define Angle2Radian(angle) ((angle) / 180.0 * M_PI)
- (void)shakingAnimation {
  CAKeyframeAnimation *anim = [CAKeyframeAnimation animation];
  anim.keyPath = @"transform.rotation";

  anim.values = @[@(Angle2Radian(-5)), @(Angle2Radian(5)), @(Angle2Radian(-5))];
  anim.duration = 0.25;

  // 動畫次數設置為最大
  anim.repeatCount = MAXFLOAT;
  // 保持動畫執行完畢後的狀態
  anim.removedOnCompletion = NO;
  anim.fillMode = kCAFillModeForwards;

  [self.layer addAnimation:anim forKey:@"shake"];
}

- (void)longClick {
  if (self.shaking) return;
  self.shaking = YES;
}

// 點擊右上角按鈕
- (void)iconClick {
  [self removeFromSuperview];
// 設計一個代理，為了在自己被刪除後做一些事情(例如，對頁面進行布局)
  if ([self.delegate respondsToSelector:@selector(deleteButtonRemoveSelf:)]) {
    [self.delegate deleteButtonRemoveSelf:self];
  }
}

- (void)coverClick {
  self.shaking = NO;
}

- (void)layoutSubviews {
  [super layoutSubviews];

  // 調整位置
  self.imageView.x = 0;
  self.imageView.y = 0;
  self.imageView.width = self.width;
  self.imageView.height = self.width;

  self.titleLabel.x = 0;
  self.titleLabel.width = self.width;
  if (self.width >= self.height) {
    self.titleLabel.height = 20;
    self.titleLabel.y = self.height - self.titleLabel.height;
  } else {
    self.titleLabel.y = self.imageView.height;
    self.titleLabel.height = self.height - self.titleLabel.y;
  }

  self.titleLabel.textAlignment = NSTextAlignmentCenter;
  self.iconBtn.size = CGSizeMake(self.width * 0.3, self.width * 0.3);
  self.iconBtn.x = self.width - self.iconBtn.width;
  self.iconBtn.y = 0;

  self.coverView.frame = self.bounds;
  [self bringSubviewToFront:self.iconBtn];
}

@end

// .h文件 只有一個代理
#import <UIKit/UIKit.h>

@class DZDeleteButton;
@protocol DZDeleteButtonDelegate <NSObject>
@optional
- (void)deleteButtonRemoveSelf:(DZDeleteButton *)button;
@end

@interface DZDeleteButton : UIButton
@property (nonatomic, weak) id<DZDeleteButtonDelegate> delegate;

@end

上面效果圖在vc中的代碼

- (void)viewDidLoad {
  [super viewDidLoad];

  DZDeleteButton *button = [[DZDeleteButton alloc] init];
  [button setImage:[UIImage imageNamed:@"bj"] forState:UIControlStateNormal];
  [button setTitle:@"百思" forState:UIControlStateNormal];
  button.delegate = self;
  button.frame = CGRectMake(20, 20, 60, 80);
  [button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
  [button addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
  [self.view addSubview:button];
}

- (void)btnClick {
  NSLog(@"點擊button");
}

- (void)deleteButtonRemoveSelf:(DZDeleteButton *)button {
  NSLog(@"已經刪除，要做什麼事");
}

以上就是本文的全部內容，希望對大家的學習有所幫助。