自定义的无数据提示界面

在开发过程中 ，越来越多的界面都需要进行友好的容错处理，例如：1、在弱网情况下的接口请求，很容易造成请求失败；2、无网情况下的界面显示；3、推进界面后数据为加载之前，显示的UI等等

直接上代码：

#import <UIKit/UIKit.h>

typedef void(^BtnActionBlock)();

@interface JHLivePlayRemindView : UIView

+ shareRemindView;

- (void)showInView:(UIView *)superView imageName:(NSString *)imageName remindTxt:(NSString *)remindTxt withBtnBlock:(BtnActionBlock)callBack;

- (void)hide;

@end

　实现代码：

#import "JHLivePlayRemindView.h"
#import "UIColor+Translate.h"
#define ScreenWidth     [[UIScreen mainScreen] bounds].size.width

@interface JHLivePlayRemindView ()
{
    UIView * containsView;
    
    UIImageView * imageView;
    
    UILabel * remindLbl;
    
    UIButton * refreshBtn ;
}

@property (nonatomic,copy)BtnActionBlock btnBlock;

@end

@implementation JHLivePlayRemindView

+ shareRemindView{
    static JHLivePlayRemindView * remindView = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        remindView = [[JHLivePlayRemindView alloc] init];
    });
    return remindView;
}

- (instancetype)init{
    self = [super init];
    if (self) {
        containsView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, ScreenWidth, 265)];
        containsView.center = self.center;
        [self addSubview:containsView];
        
        imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 140, 165)];
    
        [containsView addSubview:imageView];
        imageView.center = CGPointMake(ScreenWidth/2, imageView.center.y);
        
        remindLbl = [[UILabel alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(imageView.frame) + 20, ScreenWidth, 30)];
        remindLbl.textColor = [UIColor colorFromHexRGB:@"999999"];
        remindLbl.font = [UIFont systemFontOfSize:14.0];
        remindLbl.textAlignment = NSTextAlignmentCenter;
        [containsView addSubview:remindLbl];
        
        refreshBtn = [[UIButton alloc] initWithFrame:CGRectMake(0, CGRectGetMaxY(remindLbl.frame)+10, 90, 30)];
        [refreshBtn setImage:[UIImage imageNamed:@"JHLivePlayBundle.bundle/refresh.tiff"] forState:UIControlStateNormal];
        [refreshBtn setImage:[UIImage imageNamed:@"JHLivePlayBundle.bundle/refreshHighlighted.tiff"] forState:UIControlStateHighlighted];
        [containsView addSubview:refreshBtn];
        [refreshBtn addTarget:self action:@selector(refreshClick) forControlEvents:UIControlEventTouchUpInside];
        refreshBtn.center = CGPointMake(ScreenWidth/2, refreshBtn.center.y);
        containsView.center = CGPointMake(CGRectGetWidth(self.frame)/2, CGRectGetHeight(self.frame)/2);
       

    }
    return self;
}


- (void)showInView:(UIView *)superView imageName:(NSString *)imageName remindTxt:(NSString *)remindTxt withBtnBlock:(BtnActionBlock)callBack{
    self.backgroundColor = [UIColor whiteColor];
    self.frame = superView.bounds;
    if ([superView.subviews containsObject:self]) {
        return;
    }
    containsView.frame = CGRectMake(0, 0, ScreenWidth, CGRectGetMaxY(refreshBtn.frame));
    
    [superView addSubview:self];
    [superView bringSubviewToFront:self];
    
    containsView.center = CGPointMake(CGRectGetWidth(self.frame)/2, CGRectGetHeight(self.frame)/2);
    
    imageView.image = [UIImage imageNamed:imageName];
    imageView.center = CGPointMake(ScreenWidth/2, imageView.center.y);
    
    remindLbl.text = remindTxt;

    refreshBtn.center = CGPointMake(ScreenWidth/2, refreshBtn.center.y);
    
    if (callBack == nil) {
        refreshBtn.hidden = YES;
    }else{
        self.btnBlock = [callBack copy];
        refreshBtn.hidden = NO;
    }
}

- (void)hide{
    self.btnBlock = nil;
    [self removeFromSuperview];
}

- (void)refreshClick{
    self.btnBlock();
}

@end

　　开出的方法很简单 ，只有三个方法；

      真正起作用的方法是

- (void)showInView:(UIView *)superView imageName:(NSString *)imageName remindTxt:(NSString *)remindTxt withBtnBlock:(BtnActionBlock)callBack;

　　superView定义为需要添加提示的视图，imageName为本地的图片名称，remindTxt 为提示的文字信息，callback 为给提示按钮增加的点击事件

在完成此基础方法的扩展上 ，可以做很多事情；

　　例如:1、增加隐藏按钮的方法，只显示图片和提示文字

    　　　2、增加图片是否存在的判断，在无图片的时候增加默认的提示图片等

　　　　 3、增加文字的修饰颜色，字体大小等

             4、增加视图显示的过渡动画

有很多地方可以根据自身的需求进行扩展