自定义MJRefresh上下拉刷新

UI定义了一套gif, 用于上下拉刷新。项目里是用MJRefresh做上下拉刷新的。
做这块并不难，但是要清晰，自定义内容应该在哪里配置处理。

- (void)placeSubviews {
    
    [super placeSubviews];
//自定义UI
}

- (void)prepare {
    
    [super prepare];
   //frame相关
}

以上两个地方是关键。

项目中的配置：

.h文件：
#import <Foundation/Foundation.h>

/** 进入刷新状态的回调 */
typedef void (^refreshingBlock)(void);

@class YZRefreshGifHeader,YZRefreshGifFooter;

@interface YZMJRefreshTool : NSObject

+ (YZRefreshGifHeader *)headerWithRefreshingBlock:(refreshingBlock)refreshingBlk ;

+ (YZRefreshGifFooter *)footerWithRefreshingBlock:(refreshingBlock)refreshingBlk;

@end


@interface YZRefreshGifHeader : MJRefreshGifHeader


@end


@interface YZRefreshGifFooter : MJRefreshBackGifFooter


@end

.m文件：
#import "YZMJRefreshTool.h"
#define customGifViewHeight 100
#define customImageSize CGSizeMake(50, 50)

@implementation YZMJRefreshTool

+ (YZRefreshGifHeader *)headerWithRefreshingBlock:(refreshingBlock)refreshingBlk {
    
    YZRefreshGifHeader *header = [YZRefreshGifHeader headerWithRefreshingBlock:^{
        
        if (refreshingBlk) {
            
            refreshingBlk();
        }
    }];
    
    return header;
}

+ (YZRefreshGifFooter *)footerWithRefreshingBlock:(refreshingBlock)refreshingBlk {
    
    YZRefreshGifFooter *footer = [YZRefreshGifFooter footerWithRefreshingBlock:^{
        
        if (refreshingBlk) {
            
            refreshingBlk();
        }        
    }];
    
    return footer;
}

@end


@interface YZRefreshGifHeader()

@property (strong, nonatomic) UIImageView *smartGorImageView;

@end

@implementation YZRefreshGifHeader

- (UIImageView *)smartGorImageView {
    
    if (!_smartGorImageView) {
        
        _smartGorImageView = [[UIImageView alloc]init];
        
        [self addSubview:_smartGorImageView];
    }
    
    return _smartGorImageView;
}

- (void)placeSubviews {
    
    [super placeSubviews];
    
    self.smartGorImageView.image = [UtilityClass getGifImage];
    
    self.lastUpdatedTimeLabel.hidden = YES;
    
    self.stateLabel.hidden = YES;
}

- (void)prepare {
    
    [super prepare];
    
    self.mj_h = customGifViewHeight;
    
    [self.smartGorImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        
        make.center.equalTo(self);
        
        make.size.mas_equalTo(customImageSize);
        
    }];
}

@end


@interface YZRefreshGifFooter()

@property (strong, nonatomic) UIImageView *smartGorImageView;

@end

@implementation YZRefreshGifFooter

- (UIImageView *)smartGorImageView {
    
    if (!_smartGorImageView) {
        
        _smartGorImageView = [[UIImageView alloc]init];
        
        [self addSubview:_smartGorImageView];
    }
    
    return _smartGorImageView;
}

- (void)placeSubviews {
    
    [super placeSubviews];
    
    self.smartGorImageView.image = [UtilityClass getGifImage];
    
    self.stateLabel.hidden = YES;
}

- (void)prepare {
    
    [super prepare];
    
    self.mj_h = customGifViewHeight;
    
    [self.smartGorImageView mas_makeConstraints:^(MASConstraintMaker *make) {
        
        make.center.equalTo(self);
        
        make.size.mas_equalTo(customImageSize);
        
    }];
}

@end