六天完成一个简单iOS App - 第六天

#import "UIImage+CLExtension.h"
@implementation UIImage (CLExtension)
/** 返回圆形图片 */
-(instancetype)circleImage
{
    // 开启图形上下文
    UIGraphicsBeginImageContext(self.size);
    // 上下文
    CGContextRef ctx = UIGraphicsGetCurrentContext();
    // 添加一个圆
    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);
    CGContextAddEllipseInRect(ctx, rect);
    // 裁剪
    CGContextClip(ctx);
    // 绘制图片
    [self drawInRect:rect];
    // 获得图片
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    // 关闭图形上下文
    UIGraphicsEndImageContext();   
    return image;
}
/** 直接根据image name设置圆角 */
+(instancetype)circleImageNamed:(NSString *)name
{
    return [[UIImage imageNamed:name] circleImage];
}
@end

#import "UIImageView+CLExtension.h"
#import <UIImageView+WebCache.h>

@implementation UIImageView (CLExtension)

/** 默认为圆形头像 */
- (void)setHeader:(NSString *)url
{
    [self setCircleHeader:url];
}
/** 设置圆形头像 */
- (void)setCircleHeader:(NSString *)url
{
       // 将占位图片也转化为圆形 其实占位图片本来就是圆形
    UIImage *placeholder = [UIImage circleImageNamed:@"defaultUserIcon"];
    [self sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:placeholder completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
        // 如果image为空则返回占位图片
        if (image == nil) return;
        self.image = [image circleImage];
    }];
}
/** 设置方形头像 */
- (void)setRectHeader:(NSString *)url
{
    UIImage *placeholder = [UIImage imageNamed:@"defaultUserIcon"];
    [self sd_setImageWithURL:[NSURL URLWithString:url] placeholderImage:placeholder];
}
@end

// 添加监听
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];

- (void)keyboardWillChangeFrame:(NSNotification *)note
{    
    // 修改约束  = 屏幕的高度 - 键盘的y值
    CGFloat keyboardY = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue].origin.y;
    CGFloat screenH = [UIScreen mainScreen].bounds.size.height;
    self.bottomMargin.constant = screenH - keyboardY;
    // 执行动画
    // 获取执行动画的时间
    CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
    [UIView animateWithDuration:duration animations:^{
        // 更新约束
        [self.view layoutIfNeeded];
    }];
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section

    // 设置cell行高自动计算 自动计算尺寸
    self.commentTableView.rowHeight = UITableViewAutomaticDimension;
    // 需要先给一个大约的估算高度
    self.commentTableView.estimatedRowHeight = 44;

// 如果是第0组，并且最热评论有值则返回最评论行数
if (section == 0 && self.hotestComments.count) {
    return self.hotestComments.count;
}
// 否则都返回最新评论行数
return self.latestComments.count;

// 如果没有评论的话 服务器返回的是一个数组
if (![responseObject isKindOfClass:[NSDictionary class]]) {
    [self.commentTableView.mj_header endRefreshing];
    return ;
}

int total = [responseObject[@"total"]intValue];
if (weakSelf.latestComments.count == total) {// 说明加载完全了，隐藏上拉刷新
    // 没有更多数据，隐藏上拉加载更多
    weakSelf.commentTableView.mj_footer.hidden = YES;
}

int total = [responseObject[@"total"]intValue];
        if (weakSelf.latestComments.count == total) {// 说明加载完全了，隐藏上拉刷新
            weakSelf.commentTableView.mj_footer.hidden = YES;
        }else{
            // 结束刷新
            [weakSelf.commentTableView.mj_footer endRefreshing];
        }

/** 自动根据有无数据来显示和隐藏（有数据就显示，没有数据隐藏。默认是NO） */
self.commentTableView.mj_footer.automaticallyHidden = YES;

// viewFromNib 是在分类中对loadNibNamed方法进行的封装
CLTopicCell *cell = [CLTopicCell viewFromNib];
cell.topic = self.topic;
cell.cl_height = self.topic.cellHeight + 20;

// 设置heardView
self.commentTableView.tableHeaderView = cell;

@property(nonatomic,strong)CLComment *saveTopCom;

-(void)setupTableHeard
{
    // 如果有最热评论，则设为空
    // 当控制器销毁的时候，需要将值重新设置回来，并且将cellheight设置为0 让其在重新计算一次。所以先将他保存起来
    self.saveTopCom = self.topic.top_cmt;
    self.topic.top_cmt = nil;
    self.topic.cellHeight = 0;

    // 从xib加载cell
    CLTopicCell *cell = [CLTopicCell viewFromNib];
    cell.topic = self.topic;
    cell.cl_height = self.topic.cellHeight + 20;

// 如果使用UIView当中间的载体，需要设置cell的frame。
//    cell.frame = CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, self.topic.cellHeight);
//    // 创建heardView
//    UIView *heardView =  [[UIView alloc]init];
//    [heardView addSubview:cell];
//    heardView.cl_height = self.topic.cellHeight;
//    heardView.backgroundColor = CLCommonColor(206);

    // 设置heardView
    self.commentTableView.tableHeaderView = cell;    
}

 - (void)dealloc
{
//     控制器销毁的时候 将值重新设置回去，并将cellHeight设置为0，让其重新计算高度
    self.topic.top_cmt = self.saveTopCom;
    self.topic.cellHeight = 0;
}

- (NSString *)aParam
{
    if (self.parentViewController.class == [CLNewViewController class]) {
        return @"newlist";
    }
    return @"list";
}

btn.transform = CGAffineTransformMakeTranslation(0, self.view.bounds.size.height);

self.time = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(upData) userInfo:nil repeats:YES];

btn.transform = CGAffineTransformIdentity;

[self.time invalidate];

UIWindowLevelNormal; //默认，值为0
UIWindowLevelAlert; //值为2000 
UIWindowLevelStatusBar ; // 值为1000

//    让rect这个矩形框， 从view2坐标系转换到view1坐标系, 得出一个新的矩形框newRect
CGRect newRect = [view1 convertRect:rect fromView:view2];
//    让rect这个矩形框， 从view1坐标系转换到view2坐标系, 得出一个新的矩形框newRect
CGRect newRect = [view1 convertRect:rect toView:view2];

是否包含
CGRectContainsRect(CGRect1,CGrect2)
是否交叉
CGRectIntersectsRect(CGrect1,CGRect2)

-(BOOL)intersectWithView:(UIView *)view
{
    // 这里使用keywindow是为了防止两个控件在两个不同的window中，这种情况一般不会出现，toView:nil 默认就是控件所在的window。
    UIWindow *window = [UIApplication sharedApplication].keyWindow;
    CGRect newRect = [self convertRect:self.bounds toView:window];
    CGRect newView = [view convertRect:view.bounds toView:window];    
    return CGRectIntersectsRect(newRect, newView);
}

#import "CLTopWindow.h"
@implementation CLTopWindow
static UIWindow *window_;
+(void)show
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{    
        window_ = [[UIWindow alloc]init];
        window_.frame = [UIApplication sharedApplication].statusBarFrame;
        window_.backgroundColor = [UIColor clearColor];
        window_.windowLevel = UIWindowLevelAlert;
        window_.hidden = NO;
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(topWindowClick)];
        [window_ addGestureRecognizer:tap]; 
    });   
}
+(void)topWindowClick
{
    UIWindow *keiwindow = [UIApplication sharedApplication].keyWindow;
    [self findscrollViewsInView:keiwindow];
}
+(void)findscrollViewsInView:(UIView *)view
{
    for (UIView *subview in view.subviews) {
        [self findscrollViewsInView:subview];
    }
    if (![view isKindOfClass:[UIScrollView class]]) return;
    if(![view intersectWithView:[UIApplication sharedApplication].keyWindow])return;
    UIScrollView *scrollView = (UIScrollView *)view;
    // 修改offset
    CLLog(@"%@",scrollView);    
    CGPoint offset = scrollView.contentOffset;
    offset.y = - scrollView.contentInset.top;
    [scrollView setContentOffset:offset animated:YES];
    // 这是使scrollView显示出某个区域
    //    [scrollView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
}
@end