iOS制作带弹跳动画发布界面

项目中经常会用到带弹跳动画发布界面，具体内容如下

效果图：

代码：

// PublishView.m
// UIImage+ImageEffects.h 苹果蒙化图片的分类 pop.h弹跳动画框架 EJExtension.h模型转换框架
// ComposeModel 用于设置按钮文字与图片的模型，在本地设置plist文件保存image（按钮图片）和text（按钮文字）

#import "PublishView.h"
#import "BSVerticalButton.h"
#import "UIImage+ImageEffects.h"
#import "pop.h"
#import "MJExtension.h"
#import "ComposeModel.h"

@interface PublishView ()

/** 取消按钮 */
@property (nonatomic, weak) UIButton *cancelButton;

@end

@implementation PublishView

/** 全局 window_ */
static UIWindow *window_;

/** 显示发布view */
+ (void)show{
  // 添加一个独立的window是为了隔离点击事件
  window_ = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

  window_.hidden = NO;

  PublishView *publish = [[PublishView alloc]init];

  publish.frame = window_.bounds;

  [window_ addSubview:publish];
}

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

    UIImageView *imageView = [[UIImageView alloc]initWithImage:[self getEffectImage]];
    [self addSubview:imageView];

    [self setupUI];
  }
  return self;
}

- (void)setupUI{

  //这里用自定义的 window 是为了隔绝点击事件 不让点击事件传到后面控制器的view上去

  // 按钮弹跳动画时让view本身不能点击
  self.userInteractionEnabled = NO;

  // 从plis文件获得一个模型数组
  NSArray *buttonModelArray = [ComposeModel mj_objectArrayWithFilename:@"buttonImage.plist"];

  CGFloat button_w = 72;
  CGFloat button_h = button_w + 30;
  NSInteger maxLoc = 3; //最多列数

  //按钮弹跳动画停止后的起始 y 值
  CGFloat buttonEnd_y = ([[UIScreen mainScreen] bounds].size.height - button_h * 2) / 2;

  //最开始在屏幕外上方的的起始 y 值
  CGFloat buttonBegin_y = buttonEnd_y - [[UIScreen mainScreen] bounds].size.height;

  //按钮的起始间隙值
  CGFloat buttonStartMargin = 20;

  //中间的一个按钮相对于两边按钮的间隙
  CGFloat buttonMargin = ([[UIScreen mainScreen] bounds].size.width - buttonStartMargin * 2 - button_w * maxLoc) / (maxLoc - 1);

  for (NSInteger i = 0; i < buttonModelArray.count; ++i) {

    // BSVerticalButton 自定义的垂直排布按钮
    BSVerticalButton *button = [[BSVerticalButton alloc]init];

    button.tag = i;

    [self addSubview:button];

    [button addTarget:self action:@selector(buttonClick:) forControlEvents:UIControlEventTouchUpInside];

    ComposeModel *composeModel = buttonModelArray[i];

    [button setImage:[UIImage imageNamed:composeModel.image] forState:UIControlStateNormal];

    [button setTitle:composeModel.text forState:UIControlStateNormal];

    [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];

    button.titleLabel.font = [UIFont systemFontOfSize:14];

    NSInteger loc = i % maxLoc;  //例号
    NSInteger row = i / maxLoc;  //行号

    CGFloat button_x = buttonStartMargin + loc * (button_w + buttonMargin);
    CGFloat buttonBginAnimation_y = buttonBegin_y + (button_h * row); //弹跳前的 y 值
    CGFloat buttonEndAnimation_y = buttonEnd_y + (button_h * row); //弹跳后的 y 值

    //创建pop弹簧动画对象
    POPSpringAnimation *animation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewFrame];

    animation.beginTime = CACurrentMediaTime() + i * 0.1; //动画开始时间

    animation.springBounciness = 10; //弹簧增强 0-20

    animation.springSpeed = 8; //弹簧速度 0-20

    animation.fromValue = [NSValue valueWithCGRect:CGRectMake(button_x, buttonBginAnimation_y, button_w, button_h)];

    animation.toValue = [NSValue valueWithCGRect:CGRectMake(button_x, buttonEndAnimation_y, button_w, button_h)];

    //中间的按钮添加动画
    [button pop_addAnimation:animation forKey:nil];
  }

  // 添加品牌logo
  UIImageView *topImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"compose_slogan"]];
  topImageView.center = CGPointMake([[UIScreen mainScreen] bounds].size.width * 0.5, [[UIScreen mainScreen] bounds].size.height * 0.2 - [[UIScreen mainScreen] bounds].size.height);

  [self addSubview:topImageView];

  //  POPBasicAnimation  基本的动画
  //  POPSpringAnimation  弹簧动画
  //  POPDecayAnimation  减速动画
  //  POPCustomAnimation  自定义动画

  //创建pop弹簧动画对象
  POPSpringAnimation *animation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewCenter];

  animation.beginTime = CACurrentMediaTime() + buttonModelArray.count * 0.001; //动画开始时间

  animation.springBounciness = 10; //弹簧增强 0-20

  animation.springSpeed = 10; //弹簧速度 0-20

  CGFloat center_x = [[UIScreen mainScreen] bounds].size.width * 0.5;
  CGFloat endCenter_y = [[UIScreen mainScreen] bounds].size.height * 0.2;
  CGFloat beginCenter_y = endCenter_y - [[UIScreen mainScreen] bounds].size.height;

  animation.fromValue = [NSValue valueWithCGPoint:CGPointMake(center_x, beginCenter_y)];

  animation.toValue = [NSValue valueWithCGPoint:CGPointMake(center_x, endCenter_y)];

  animation.completionBlock = ^(POPAnimation *anim, BOOL finished){
    NSLog(@"-------这里可以写动画结束后所要执行的代码...");
    // view本身开启交互
    self.userInteractionEnabled = YES;
  };

  //给顶部的图片添加动画
  [topImageView pop_addAnimation:animation forKey:nil];
  // 底部取消按钮
  UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeSystem];
  [cancelButton setTitle:@"取 消" forState:UIControlStateNormal];
  cancelButton.titleLabel.font = [UIFont systemFontOfSize:15];
  [cancelButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
  [cancelButton setBackgroundColor:[UIColor whiteColor]];
  [cancelButton addTarget:self action:@selector(cancelButtonClick:) forControlEvents:UIControlEventTouchUpInside];
  [self addSubview:cancelButton];
  self.cancelButton = cancelButton;
}

- (void)cancelButtonClick:(UIButton *)button{

  // 退出时执行动画 方法的参数block传空
  [self animationWithBlock:nil];
}

- (void)layoutSubviews{

  [super layoutSubviews];

  // 取消按钮位置大小
  CGPoint center = self.cancelButton.center;
  center.x = self.center.x;
  self.cancelButton.center = center;
  CGRect frame = self.cancelButton.frame;
  frame.origin.y = self.frame.size.height * 0.85;
  frame.size = CGSizeMake(200, 35);
  self.cancelButton.frame = frame;
}

- (void)buttonClick:(UIButton *)button{

  [self animationWithBlock:^{
    switch (button.tag) {
      case 0:
        NSLog(@"发视频");
        break;
      case 1:
        NSLog(@"发图片");
        break;
      case 2:{

        NSLog(@"发段子");
      }
        break;
      case 3:
        NSLog(@"发声音");
        break;
      case 4:
        NSLog(@"审贴子");
        break;
      case 5:
        NSLog(@"离线下载");
        break;

      default:
        break;
    }
  }];

}

/** 退出时与点出了某个按钮时执行的弹跳动画后销毁 window_ 移除 这个蒙板 view ,如果block参数completionBlock有值先销毁window_后再执行这个block里的代码块 */
- (void)animationWithBlock:(void (^) ())completionBlock{

  NSLog(@"----%@\n",self.subviews);

  //退出的时候这里用自定义的 window 是为了隔绝点击事件 不让点击事件传到后面控制器的view上去
  // view本身不能点
  self.userInteractionEnabled = NO;

  // 选移除取消按钮
  [self.cancelButton removeFromSuperview];

  for (NSInteger i = 1; i < self.subviews.count; ++i) {

    UIView *view = self.subviews[i];

    //创建pop基本动画对象
    POPBasicAnimation *animation = [POPBasicAnimation animationWithPropertyNamed:kPOPViewCenter];
    //    POPSpringAnimation *animation = [POPSpringAnimation animationWithPropertyNamed:kPOPViewCenter];

    animation.beginTime = CACurrentMediaTime() + (i-1) * 0.1; //动画开始时间

    // 如果用这个基类 POPBasicAnimation 动画的执行节奏(一开始很慢, 后面很快)
    animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];

    CGPoint center = view.center; //取出中心点

    animation.toValue = [NSValue valueWithCGPoint:CGPointMake(center.x , center.y + [[UIScreen mainScreen] bounds].size.height)];

    if (i == self.subviews.count-1) { //说明是最后一个 view在做动画,就让执行结束的 block
      // 动画结束时调用的 block
      animation.completionBlock = ^(POPAnimation *anim, BOOL finished){

        NSLog(@"取消时 这里可以写动画结束后所要执行的代码...");

        [self removeFromSuperview];

        window_ = nil; //销毁自定义的 window

        !completionBlock ? : completionBlock();
      };
    }
    //给顶部的图片添加动画
    [view pop_addAnimation:animation forKey:nil];
  }
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

  [self animationWithBlock:nil];
}

// 获得一个磨纱蒙板 image 图片
- (UIImage *)getEffectImage{
  UIWindow *window = [UIApplication sharedApplication].keyWindow; //获取当前 window
  UIGraphicsBeginImageContext(window.size); //开启window大小的图形上下文
  CGContextRef ref = UIGraphicsGetCurrentContext(); //开启图形上下文
  [window.layer renderInContext:ref]; //把window图层 渲染到图形上下文当中
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); //获取图片
  UIGraphicsEndImageContext(); //关闭图形上下文
  image = [image applyLightEffect]; //调用 image 分类方法 使图片调成蒙板状态
  return image;
}

@end

项目中用到的垂直布局自定义按钮 BSVerticalButton

#import "BSVerticalButton.h"

@implementation BSVerticalButton

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

- (void)awakeFromNib{

  [super awakeFromNib];

  [self setupUI];
}

- (void)setupUI{

  self.titleLabel.textAlignment = NSTextAlignmentCenter;

}

- (void)layoutSubviews{

  [super layoutSubviews];

  //按钮内部图片 frame
  CGRect imageViewFrame = self.imageView.frame;
  imageViewFrame.origin.x = 0;
  imageViewFrame.origin.y = 0;
  imageViewFrame.size.width = self.bounds.size.width;
  imageViewFrame.size.height = self.bounds.size.width;
  self.imageView.frame = imageViewFrame;

  //按钮内部label frame
  CGRect titleLabelFrame = self.titleLabel.frame;
  titleLabelFrame.origin.x = 0;
  titleLabelFrame.origin.y = self.imageView.frame.size.height + 10;
  titleLabelFrame.size.width = self.bounds.size.width;
  self.titleLabel.frame = titleLabelFrame;

  //按钮自身大小
  CGRect buttonBounds = self.bounds;
  buttonBounds.size.width = self.imageView.frame.size.width;
  buttonBounds.size.height = self.imageView.bounds.size.height + self.titleLabel.bounds.size.height + 10;
  self.bounds = buttonBounds;
}
@end

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