erpsuiteios/common/UIScrollVIew+Empty/RAEmptyDataView.m

//
//  RAEmptyDataView.m
//  UIScrollViewEmpty
//
//  Created by Jack on 2018/9/5.
//  Copyright © 2018年 United Software Applications. All rights reserved.
//

#import "RAEmptyDataView.h"

@implementation RAEmptyDataView

#pragma mark - Initial

- (instancetype)init {
    if (self = [super init]) {
        self.backgroundColor = [UIColor clearColor];
//        self.translatesAutoresizingMaskIntoConstraints = NO;
    }
    return self;
}

- (void)setFrame:(CGRect)frame {
    [super setFrame:frame];
}

- (void)didMoveToSuperview {
    [super didMoveToSuperview];
    self.frame = self.superview.bounds;
}

- (void)willMoveToSuperview:(UIView *)newSuperview {
    [super willMoveToSuperview:newSuperview];
}

- (void)setHidden:(BOOL)hidden {
    [super setHidden:hidden];
}

- (void)layoutSubviews {
    [super layoutSubviews];
    
    if (self.emptyView) {
        
        CGFloat w = self.bounds.size.width;
        CGFloat h = self.bounds.size.height;
        CGFloat emptyW = self.emptyView.bounds.size.width;
        CGFloat emptyH = self.emptyView.bounds.size.height;
        
        CGFloat x = (w - emptyW) * 0.5;
        CGFloat y = (h - emptyH) * 0.5;
        self.emptyView.frame = CGRectMake(x, y, emptyW, emptyH);
    }
}

- (void)clear {
    NSArray *subviews = self.subviews;
    if (subviews && subviews.count > 0) {
        for (UIView *subview in subviews) {
            [subview removeFromSuperview];
        }
    }
}

- (void)setEmptyView:(UIView *)emptyView {
    _emptyView = emptyView;
    
    [self clear];
    [self addSubview:_emptyView];

//    NSLayoutConstraint *enterX = [NSLayoutConstraint constraintWithItem:_emptyView
//                                                             attribute:NSLayoutAttributeCenterX
//                                                             relatedBy:NSLayoutRelationEqual
//                                                                toItem:self
//                                                             attribute:NSLayoutAttributeCenterX
//                                                            multiplier:1
//                                                              constant:0];
//
//    NSLayoutConstraint *enterY = [NSLayoutConstraint constraintWithItem:_emptyView
//                                                              attribute:NSLayoutAttributeCenterY
//                                                              relatedBy:NSLayoutRelationEqual
//                                                                 toItem:self
//                                                              attribute:NSLayoutAttributeCenterY
//                                                             multiplier:1
//                                                               constant:0];
//
//    NSLayoutConstraint *w = [NSLayoutConstraint constraintWithItem:_emptyView
//                                                              attribute:NSLayoutAttributeWidth
//                                                              relatedBy:NSLayoutRelationEqual
//                                                                 toItem:nil
//                                                              attribute:NSLayoutAttributeNotAnAttribute
//                                                             multiplier:1
//                                                               constant:100];
//
//    NSLayoutConstraint *h = [NSLayoutConstraint constraintWithItem:_emptyView
//                                                              attribute:NSLayoutAttributeHeight
//                                                              relatedBy:NSLayoutRelationEqual
//                                                                 toItem:nil
//                                                              attribute:NSLayoutAttributeNotAnAttribute
//                                                             multiplier:1
//                                                               constant:70];
//
//
//    [self addConstraints:@[enterX,enterY,w,h]];
}

@end