用POP动画编写带富文本的自定义动画效果

//
//  POPNumberCount.h
//  POP
//
//  Created by XianMingYou on 15/4/10.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import <Foundation/Foundation.h>
#import "POP.h"

@class POPNumberCount;

@protocol POPNumberCountDelegate <NSObject>
@optional
/**
 *  最原始的方法
 *
 *  @param numberCount 对象自己
 *  @param number      变化的值
 */
- (void)numberCount:(POPNumberCount *)numberCount currentNumber:(NSNumber *)number;

/**
 *  子类可以实现的方法
 *
 *  @param numberCount 对象自己
 *  @param string      子类返回的富文本
 */
- (void)numberCount:(POPNumberCount *)numberCount currentAttributedString:(NSAttributedString *)string;

/**
 *  子类可以实现的方法
 *
 *  @param numberCount 对象自己
 *  @param string      子类返回的文本
 */
- (void)numberCount:(POPNumberCount *)numberCount currentString:(NSString *)string;

@end


@interface POPNumberCount : NSObject

@property (nonatomic, weak)   id<POPNumberCountDelegate> delegate;       // 代理

@property (nonatomic, assign) CGFloat                    fromValue;      // 开始值
@property (nonatomic, assign) CGFloat                    toValue;        // 结束值
@property (nonatomic, assign) CGFloat                    currentValue;   // 当前值
@property (nonatomic, assign) NSTimeInterval             duration;       // 持续时间

@property (nonatomic, strong) CAMediaTimingFunction     *timingFunction; // 时间函数
@property (nonatomic, strong) POPBasicAnimation         *conutAnimation;

/*
 *  存储值(执行动画之前，请先将设置的值进行存储)
 */
- (void)saveValues;

/*
 *  开始动画(继承的子类需要重写本方法来，然后与代理一起配合使用)
 */
- (void)startAnimation;

/*
 *  停止动画
 */
- (void)stopAnimation;

@end

//
//  POPNumberCount.m
//  POP
//
//  Created by XianMingYou on 15/4/10.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "POPNumberCount.h"
#import "ConfigAttributedString.h"

@implementation POPNumberCount

- (instancetype)init {
    self = [super init];
    if (self) {
        self.conutAnimation = [POPBasicAnimation animation];
    }
    return self;
}

- (void)saveValues {
    self.conutAnimation.fromValue = @(self.fromValue);
    self.conutAnimation.toValue   = @(self.toValue);
    self.conutAnimation.duration  = (self.duration <= 0 ? 0.4f : self.duration);
    if (self.timingFunction) {
        self.conutAnimation.timingFunction = self.timingFunction;
    }
}

- (void)startAnimation {
    // 只有执行了代理才会执行计数引擎
    if (self.delegate && [self.delegate respondsToSelector:@selector(numberCount:currentNumber:)]) {
        /* 将计算出来的值通过writeBlock动态给控件设定 */
        self.conutAnimation.property =         [POPMutableAnimatableProperty propertyWithName:@"conutAnimation"
                                           initializer:^(POPMutableAnimatableProperty *prop) {
                                               prop.writeBlock      = ^(id obj, const CGFloat values[]) {
                                                   NSNumber *number = @(values[0]);
                                                   _currentValue    = values[0];
                                                   
                                                   /* ------------- 子类重写父类的这个方法 ------------- */
                                                   [_delegate numberCount:self currentNumber:number];
                                                   /* ---------------------------------------------- */
                                               };
                                           }];
        
        // 添加动画
        [self pop_addAnimation:self.conutAnimation forKey:nil];
    }
}

- (void)stopAnimation {
    [self pop_removeAllAnimations];
}

@end