iOS UIView点击高亮效果

骑猪看日落 2022-06-05 03:43 350阅读 0赞

模范UIbuton的高亮效果，代码如下：

ViewClickEffect.h

#import <UIKit/UIKit.h>
    
    @interface ViewClickEffect : UIView
    
    @end

ViewClickEffect.m

#import "ViewClickEffect.h"
    
    @interface ViewClickEffect ()
    @property(nonatomic, unsafe_unretained) CGFloat oldAlpha;
    @end
    
    @implementation ViewClickEffect
    - (void)awakeFromNib {
      [super awakeFromNib];
      [self commonInit];
    }
    
    - (instancetype)init {
      if (self = [super init]) {
        [self commonInit];
      }
      return self;
    }
    
    - (instancetype)initWithCoder:(NSCoder *)coder {
      self = [super initWithCoder:coder];
      if (self) {
        [self commonInit];
      }
      return self;
    }
    
    - (instancetype)initWithFrame:(CGRect)frame {
      self = [super initWithFrame:frame];
      if (self) {
        [self commonInit];
      }
      return self;
    }
    
    - (void)commonInit {
      self.oldAlpha = self.alpha;
    }
    
    - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
      [super touchesBegan:touches withEvent:event];
      self.alpha = self.oldAlpha / 4;
    }
    
    - (void)touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
      [super touchesEnded:touches withEvent:event];
      self.alpha = self.oldAlpha;
    }
    
    - (void)touchesCancelled:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
      [super touchesCancelled:touches withEvent:event];
      self.alpha = self.oldAlpha;
    }
    
    - (void)touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
      [super touchesCancelled:touches withEvent:event];
        
    }
    
    @end

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