Novel/XiaoShuoHui/TFReader/Classes/Other/Lib/TFEmptyView/TFEmptyView.m

//
//  TFEmptyView.m
//  WXReader
//
//  Created by 谢腾飞 on 2020/11/20.
//  Copyright © 2020 xtfei_2011@126.com. All rights reserved.
//

#import "TFEmptyView.h"

// 每个子控件之间的间距
#define kSubViewMargin              20.f
// 描述字体
#define kTitleLabFont               [UIFont systemFontOfSize:16.f]
// 详细描述字体
#define kDetailLabFont              [UIFont systemFontOfSize:14.f]
// 按钮字体大小
#define kActionBtnFont              [UIFont systemFontOfSize:14.f]
// 按钮高度
#define kActionBtnHeight            40.f
// 水平方向内边距
#define kActionBtnHorizontalMargin  30.f
// 灰色
#define kGrayColor [UIColor colorWithRed:0.5f green:0.5f blue:0.5f alpha:1.f]

@interface TFEmptyView ()

@property (nonatomic ,strong) UILabel *titleLabel;
@property (nonatomic ,strong) UILabel *detailLabel;
@property (nonatomic ,strong) UIButton *actionButton;

@end

@implementation TFEmptyView
{
    CGFloat _contentMaxWidth; // 最大宽度
    CGFloat _contentWidth;    // 内容物宽度
    CGFloat _contentHeight;   // 内容物高度
    CGFloat _subViweMargin;   // 间距
}

- (void)prepare
{
    [super prepare];
    
    self.contentViewY = 1000;
}

- (void)setupSubviews
{
    [super setupSubviews];
    
    _contentMaxWidth = self.xtfei_width - 30.f;
    _contentWidth = 0;
    _contentHeight = 0;
    _subViweMargin = self.subViewMargin ? self.subViewMargin : kSubViewMargin;
    
    // 占位图片
    UIImage *image = [UIImage imageNamed:self.image];
    if (image) {
        [self setupPromptImageView:image];
    } else {
        if (_promptImageView) {
            [_promptImageView removeFromSuperview];
        }
    }
    
    // 标题
    if (self.title.length) {
        [self setupTitleLabel:self.title];
    } else {
        if (_titleLabel) {
            [_titleLabel removeFromSuperview];
        }
    }
    
    // 详细描述
    if (self.detail.length) {
        [self setupDetailLabel:self.detail];
    } else {
        if (_detailLabel) {
            [_detailLabel removeFromSuperview];
        }
    }
    
    // 按钮
    if (self.btnTitle.length) {
        if (self.actionBtnTarget && self.actionBtnAction) {
            [self setupActionBtn:self.btnTitle target:self.actionBtnTarget action:self.actionBtnAction btnClickBlock:nil];
        } else if (self.btnClickBlock) {
            [self setupActionBtn:self.btnTitle target:nil action:nil btnClickBlock:self.btnClickBlock];
        } else {
            if (_actionButton) {
                [_actionButton removeFromSuperview];
            }
        }
    } else {
        if (_actionButton) {
            [_actionButton removeFromSuperview];
        }
    }
    
    // 自定义view
    if (self.customView) {
        _contentWidth = self.customView.xtfei_width;
        _contentHeight = self.customView.xtfei_y + self.customView.xtfei_height;
    }
    
    // 设置frame
    [self setSubViewFrame];
}

- (void)setSubViewFrame
{
    CGFloat scrollViewWidth = self.bounds.size.width;
    CGFloat scrollViewHeight = self.bounds.size.height;
    
    self.xtfei_size = CGSizeMake(_contentWidth, _contentHeight);
    CGFloat emptyViewCenterX = scrollViewWidth * 0.5f;
    CGFloat emptyViewCenterY = scrollViewHeight * 0.5f;
    self.center = CGPointMake(emptyViewCenterX, emptyViewCenterY);
    
    self.contentView.frame = self.bounds;
    
    CGFloat centerX = self.contentView.xtfei_width * 0.5f;
    if (self.customView) {
        self.customView.xtfei_centerX = centerX;
        
    } else {
        _promptImageView.xtfei_centerX = centerX;
        _titleLabel.xtfei_centerX = centerX;
        _detailLabel.xtfei_centerX = centerX;
        _actionButton.xtfei_centerX = centerX;
    }
    
    if (self.contentViewOffset) {
        self.xtfei_centerY += self.contentViewOffset;
    }
    
    if (self.contentViewY < 1000) {
        self.xtfei_y = self.contentViewY;
    }
}

- (void)setupPromptImageView:(UIImage *)img
{
    self.promptImageView.image = img;
    
    CGFloat imgViewWidth = img.size.width;
    CGFloat imgViewHeight = img.size.height;
    
    self.promptImageView.image = [img imageWithRenderingMode:(UIImageRenderingModeAlwaysOriginal)];
    
    if (self.imageSize.width && self.imageSize.height) {
        if (imgViewWidth > imgViewHeight) {
            imgViewHeight = (imgViewHeight / imgViewWidth) * self.imageSize.width;
            imgViewWidth = self.imageSize.width;
        } else {
            imgViewWidth = (imgViewWidth / imgViewHeight) * self.imageSize.height;
            imgViewHeight = self.imageSize.height;
        }
    }
    self.promptImageView.frame = CGRectMake(0, 0, imgViewWidth, imgViewHeight);
    
    _contentWidth = self.promptImageView.xtfei_size.width;
    _contentHeight = self.promptImageView.xtfei_y + self.promptImageView.xtfei_height;
}

- (void)setupTitleLabel:(NSString *)titleStr
{
    UIFont *font = self.titleLabFont.pointSize ? self.titleLabFont : kTitleLabFont;
    CGFloat fontSize = [TFViewHelper getDynamicHeightWithLabelFont:font labelWidth:SCREEN_WIDTH labelText:titleStr];
    UIColor *textColor = self.titleLabTextColor ? self.titleLabTextColor : kBlackColor;
    CGFloat width = [self returnTextWidth:titleStr size:CGSizeMake(_contentMaxWidth, fontSize) font:font].width;
    
    self.titleLabel.frame = CGRectMake(0, _contentHeight + _subViweMargin, width, fontSize);
    self.titleLabel.font = font;
    self.titleLabel.text = titleStr;
    self.titleLabel.textColor = textColor;
    
    _contentWidth = width > _contentWidth ? width : _contentWidth;
    _contentHeight = self.titleLabel.xtfei_y + self.titleLabel.xtfei_height;
}

- (void)setupDetailLabel:(NSString *)detailStr
{
    UIColor *textColor = self.detailLabTextColor ? self.detailLabTextColor : kGrayColor;
    UIFont *font = self.detailLabFont.pointSize ? self.detailLabFont : kDetailLabFont;
    CGFloat fontSize = font.pointSize;
    
    CGFloat maxHeight = self.detailLabMaxLines ? self.detailLabMaxLines * (fontSize + 5) : 2 * (fontSize + 5);
    CGSize size = [self returnTextWidth:detailStr size:CGSizeMake(_contentMaxWidth, maxHeight) font:font];
    CGFloat width = size.width;
    CGFloat height = size.height;
    
    self.detailLabel.font = font;
    self.detailLabel.frame = CGRectMake(0, _contentHeight + _subViweMargin, width, height);
    self.detailLabel.text = detailStr;
    self.detailLabel.textColor = textColor;
    
    _contentWidth = width > _contentWidth ? width : _contentWidth;
    _contentHeight = self.detailLabel.xtfei_y + self.detailLabel.xtfei_height;
}

- (void)setupActionBtn:(NSString *)btnTitle target:(id)target action:(SEL)action btnClickBlock:(TFActionTapBlock)btnClickBlock
{
    UIFont *font = self.actionBtnFont.pointSize ? self.actionBtnFont : kActionBtnFont;
    CGFloat fontSize = font.pointSize;
    UIColor *titleColor = self.actionBtnTitleColor ? self.actionBtnTitleColor : kBlackColor;
    UIColor *backGColor = self.actionBtnBackGroundColor ? self.actionBtnBackGroundColor : [UIColor whiteColor];
    UIColor *borderColor = self.actionBtnBorderColor ? self.actionBtnBorderColor : [UIColor colorWithRed:0.8f green:0.8f blue:0.8f alpha:1];
    CGFloat borderWidth = self.actionBtnBorderWidth ? self.actionBtnBorderWidth : 0.0f;
    CGFloat cornerRadius = self.actionBtnCornerRadius ? self.actionBtnCornerRadius : 5.f;
    CGFloat horiMargin = self.actionBtnHorizontalMargin ? self.actionBtnHorizontalMargin : kActionBtnHorizontalMargin;
    CGFloat height = self.actionBtnHeight ? self.actionBtnHeight : kActionBtnHeight;
    CGSize textSize = [self returnTextWidth:btnTitle size:CGSizeMake(_contentMaxWidth, fontSize) font:font];
    
    if (height < textSize.height) {
        height = textSize.height + 4;
    }
    
    // 按钮的宽高
    CGFloat btnWidth = textSize.width + horiMargin * 2;
    CGFloat btnHeight = height;
    btnWidth = btnWidth > _contentMaxWidth ? _contentMaxWidth : btnWidth;
    
    self.actionButton.frame = CGRectMake(0, _contentHeight + _subViweMargin, btnWidth, btnHeight);
    [self.actionButton setTitle:btnTitle forState:UIControlStateNormal];
    self.actionButton.titleLabel.font = font;
    self.actionButton.backgroundColor = backGColor;
    [self.actionButton setTitleColor:titleColor forState:UIControlStateNormal];
    self.actionButton.layer.borderColor = borderColor.CGColor;
    self.actionButton.layer.borderWidth = borderWidth;
    self.actionButton.layer.cornerRadius = cornerRadius;
    
    // 添加事件
    if (target && action) {
        [self.actionButton addTarget:target action:action forControlEvents:UIControlEventTouchUpInside];
        [self.actionButton addTarget:self action:@selector(actionBtnClick:) forControlEvents:UIControlEventTouchUpInside];
    } else if (btnClickBlock) {
        [self.actionButton addTarget:self action:@selector(actionBtnClick:) forControlEvents:UIControlEventTouchUpInside];
    }
    
    _contentWidth = btnWidth > _contentWidth ? btnWidth : _contentWidth;
    _contentHeight = self.actionButton.xtfei_y + self.actionButton.xtfei_height;
}

- (UIImageView *)promptImageView
{
    if (!_promptImageView) {
        _promptImageView = [[UIImageView alloc] init];
        _promptImageView.contentMode = UIViewContentModeScaleAspectFit;
        [self.contentView addSubview:_promptImageView];
    }
    return _promptImageView;
}

- (UILabel *)titleLabel
{
    if (!_titleLabel) {
        _titleLabel = [[UILabel alloc] init];
        _titleLabel.textAlignment = NSTextAlignmentCenter;
        [self.contentView addSubview:_titleLabel];
    }
    return _titleLabel;
}

- (UILabel *)detailLabel
{
    if (!_detailLabel) {
        _detailLabel = [[UILabel alloc] init];
        _detailLabel.textAlignment = NSTextAlignmentCenter;
        _detailLabel.numberOfLines = 0;
        [self.contentView addSubview:_detailLabel];
    }
    return _detailLabel;
}

- (UIButton *)actionButton
{
    if (!_actionButton) {
        _actionButton = [[UIButton alloc] init];
        _actionButton.layer.masksToBounds = YES;
        [self.contentView addSubview:_actionButton];
    }
    return _actionButton;
}


- (void)setSubViewMargin:(CGFloat)subViewMargin
{
    if (_subViewMargin != subViewMargin) {
        _subViewMargin = subViewMargin;
        
        if (_promptImageView || _titleLabel || _detailLabel || _actionButton || self.customView) {
            [self setupSubviews];
        }
    }
}

- (void)setContentViewOffset:(CGFloat)contentViewOffset
{
    if (_contentViewOffset != contentViewOffset) {
        _contentViewOffset = contentViewOffset;
        
        if (_promptImageView || _titleLabel || _detailLabel || _actionButton || self.customView) {
            self.xtfei_centerY += self.contentViewOffset;
        }
    }
}

- (void)setContentViewY:(CGFloat)contentViewY
{
    if (_contentViewY != contentViewY) {
        _contentViewY = contentViewY;
        
        if (_promptImageView || _titleLabel || _detailLabel || _actionButton || self.customView) {
            self.xtfei_y = self.contentViewY;
        }
    }
}

- (void)setImageSize:(CGSize)imageSize
{
    if (_imageSize.width != imageSize.width || _imageSize.height != imageSize.height) {
        _imageSize = imageSize;
        
        if (_promptImageView) {
            [self setupSubviews];
        }
    }
}

- (void)setTitleLabFont:(UIFont *)titleLabFont
{
    if (_titleLabFont != titleLabFont) {
        _titleLabFont = titleLabFont;

        if (_titleLabel) {
            [self setupSubviews];
        }
    }
}

- (void)setTitleLabTextColor:(UIColor *)titleLabTextColor
{
    if (_titleLabTextColor != titleLabTextColor) {
        _titleLabTextColor = titleLabTextColor;
        
        if (_titleLabel) {
            _titleLabel.textColor = titleLabTextColor;
        }
    }
}

- (void)setDetailLabFont:(UIFont *)detailLabFont
{
    if (_detailLabFont != detailLabFont) {
        _detailLabFont = detailLabFont;
        
        if (_detailLabel) {
            [self setupSubviews];
        }
    }
}

- (void)setDetailLabMaxLines:(NSInteger)detailLabMaxLines
{
    if (_detailLabMaxLines != detailLabMaxLines) {
        _detailLabMaxLines = detailLabMaxLines;
        
        if (_detailLabel) {
            [self setupSubviews];
        }
    }
}

- (void)setDetailLabTextColor:(UIColor *)detailLabTextColor
{
    if (_detailLabTextColor != detailLabTextColor) {
        _detailLabTextColor = detailLabTextColor;
        
        if (_detailLabel) {
            _detailLabel.textColor = detailLabTextColor;
        }
    }
}

- (void)setActionBtnFont:(UIFont *)actionBtnFont
{
    if (_actionBtnFont != actionBtnFont) {
        _actionBtnFont = actionBtnFont;
        
        if (_actionButton) {
            [self setupSubviews];
        }
    }
}

- (void)setActionBtnHeight:(CGFloat)actionBtnHeight
{
    if (_actionBtnHeight != actionBtnHeight) {
        _actionBtnHeight = actionBtnHeight;
        
        if (_actionButton) {
            [self setupSubviews];
        }
    }
}

- (void)setActionBtnHorizontalMargin:(CGFloat)actionBtnHorizontalMargin
{
    if (_actionBtnHorizontalMargin != actionBtnHorizontalMargin) {
        _actionBtnHorizontalMargin = actionBtnHorizontalMargin;
        
        if (_actionButton) {
            [self setupSubviews];
        }
    }
}

- (void)setActionBtnCornerRadius:(CGFloat)actionBtnCornerRadius
{
    if (_actionBtnCornerRadius != actionBtnCornerRadius) {
        _actionBtnCornerRadius = actionBtnCornerRadius;
        
        if (_actionButton) {
            _actionButton.layer.cornerRadius = actionBtnCornerRadius;
        }
    }
}

- (void)setActionBtnBorderWidth:(CGFloat)actionBtnBorderWidth
{
    if (actionBtnBorderWidth != _actionBtnBorderWidth) {
        _actionBtnBorderWidth = actionBtnBorderWidth;

        if (_actionButton) {
            _actionButton.layer.borderWidth = actionBtnBorderWidth;
        }
    }
}

- (void)setActionBtnBorderColor:(UIColor *)actionBtnBorderColor
{
    if (_actionBtnBorderColor != actionBtnBorderColor) {
        _actionBtnBorderColor = actionBtnBorderColor;
        
        if (_actionButton) {
            _actionButton.layer.borderColor = actionBtnBorderColor.CGColor;
        }
    }
}

- (void)setActionBtnTitleColor:(UIColor *)actionBtnTitleColor
{
    if (_actionBtnTitleColor != actionBtnTitleColor) {
        _actionBtnTitleColor = actionBtnTitleColor;
        
        if (_actionButton) {
            [_actionButton setTitleColor:actionBtnTitleColor forState:UIControlStateNormal];
        }
    }
}

- (void)setActionBtnBackGroundColor:(UIColor *)actionBtnBackGroundColor
{
    if (actionBtnBackGroundColor != _actionBtnBackGroundColor) {
        _actionBtnBackGroundColor = actionBtnBackGroundColor;
        
        if (_actionButton) {
            [_actionButton setBackgroundColor:actionBtnBackGroundColor];
        }
    }
}

- (void)actionBtnClick:(UIButton *)sender
{
    if (self.btnClickBlock) {
        self.btnClickBlock();
    }
}

- (CGSize)returnTextWidth:(NSString *)text size:(CGSize)size font:(UIFont *)font
{
    return [text boundingRectWithSize:size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:font} context:nil].size;
}
@end