子类继承父类实现父类的代理方法

子类继承父类实现父类的代理方法

父类提供虚函数(OC中称为代理方法),子类继承后实现虚函数来实现特定的功能.

父类方法:

NumberCount.h 与 NumberCount.m

//
//  NumberCount.h
//  YXMWeather
//
//  Created by XianMingYou on 15/2/18.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import <Foundation/Foundation.h>
@class NumberCount;

@protocol NumberCountDelegate <NSObject>

@optional
/**
 *  最原始的方法
 *
 *  @param numberCount 对象自己
 *  @param number      变化的值
 */
- (void)numberCount:(NumberCount *)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:(NumberCount *)numberCount currentSting:(NSAttributedString *)string;

@end

@interface NumberCount : NSObject

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

/**
 *  动画实体
 */
@property (nonatomic, strong) POPBasicAnimation *conutAnimation;

/**
 *  初始值
 */
@property (nonatomic) CGFloat fromValue;

/**
 *  结束值
 */
@property (nonatomic) CGFloat toValue;

/**
 *  动画持续时间
 */
@property (nonatomic) CGFloat duration;

/**
 *  开始动画
 */
- (void)startAnimation;

@end

//
//  NumberCount.m
//  YXMWeather
//
//  Created by XianMingYou on 15/2/18.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "NumberCount.h"
#import "POP.h"

@implementation NumberCount

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

- (void)startAnimation {
    
    // 初始化值
    CGFloat fromeValue = self.fromValue;
    CGFloat toValue    = self.toValue;
    CGFloat duration   = (self.duration <= 0 ? 1.f : self.duration);
    
    // 设定动画
    self.conutAnimation.fromValue      = @(fromeValue);
    self.conutAnimation.toValue        = @(toValue);
    self.conutAnimation.timingFunction = 
        [CAMediaTimingFunction functionWithControlPoints:0.69 :0.11 :0.32 :0.88];
    self.conutAnimation.duration       = duration;

    // 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]);
                                                   [_delegate numberCount:self currentNumber:number];
                                               };
                                           }];
        
        // 添加动画
        [self pop_addAnimation:self.conutAnimation forKey:nil];
    }
}

@end

子类方法:

//
//  HumidityCount.h
//  YXMWeather
//
//  Created by XianMingYou on 15/2/18.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "NumberCount.h"

@interface HumidityCount : NumberCount

- (void)startAnimation;

@end

//
//  HumidityCount.m
//  YXMWeather
//
//  Created by XianMingYou on 15/2/18.
//  Copyright (c) 2015年 XianMingYou. All rights reserved.
//

#import "HumidityCount.h"
#import "NSString+RichText.h"

@implementation HumidityCount

- (void)startAnimation {
    // 初始化值
    CGFloat fromeValue = self.fromValue;
    CGFloat toValue    = self.toValue;
    CGFloat duration   = (self.duration <= 0 ? 1.f : self.duration);
    
    // 设定动画
    self.conutAnimation.fromValue      = @(fromeValue);
    self.conutAnimation.toValue        = @(toValue);
    self.conutAnimation.timingFunction = 
    [CAMediaTimingFunction functionWithControlPoints:0.69 :0.11 :0.32 :0.88];
    self.conutAnimation.duration       = duration;
    
    // 只有执行了代理才会执行计数引擎
    if (self.delegate && [self.delegate respondsToSelector:@selector(numberCount:currentSting:)]) {
        /* 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]);
                                                   
                                                   NSAttributedString *ats = [self accessNumber:number];
                                                   [self.delegate numberCount:self currentSting:ats];
                                               };
                                           }];
        
        // 添加动画
        [self pop_addAnimation:self.conutAnimation forKey:nil];
    }
}

// 处理富文本
- (NSAttributedString *)accessNumber:(NSNumber *)number {
    
    NSInteger count    = [number integerValue];
    
    NSString *countStr = [NSString stringWithFormat:@"%02ld", (long)count];
    NSString *totalStr = [NSString stringWithFormat:@"%@%%", countStr];
    
    UIFont *font1       = [UIFont fontWithName:LATO_REGULAR size:40.f];
    UIFont *font2       = [UIFont fontWithName:LATO_BOLD size:9.f];
    
    NSRange totalRange   = [totalStr range];              // 全局的区域
    NSRange countRange   = [countStr rangeFrom:totalStr]; // %的区域
    
    return [totalStr createAttributedStringAndConfig:@[
                                                       // 全局设置
                                                       [ConfigAttributedString font:font2
                                                                              range:totalRange],
                                                       [ConfigAttributedString font:font1
                                                                              range:countRange],
                                                       
                                                       // 局部设置
                                                       [ConfigAttributedString foregroundColor:[UIColor redColor]
                                                                                         range:countRange],

                                                       ]];
}

@end

有以下几点需要注意: