iOS 坐标转换，tableViewCell图片点击放大缩小回原位 —— HERO博客

之前写了一片文章：基于MVC设计模式练习UITableView使用，今天就根据这篇文章中的例子简述坐标转换实际应用。

首先，了解一下坐标转换的几个方法：

//返回CGRect

- (CGRect)convertRect:(CGRect)rect toView:(UIView *)view;

- (CGRect)convertRect:(CGRect)rect fromView:(UIView *)view;

例：将C视图中B的坐标位置转换为在A中的坐标位置，两个方法一样的结果

CGRect frame = [C convertRect:B toView:A];

CGRect frame = [A convertRect:B fromView:C];

//返回CGPoint，对象返回值不同，用法和上面相同

- (CGPoint)convertPoint:(CGPoint)point toView:(UIView *)view;

- (CGPoint)convertPoint:(CGPoint)point fromView:(UIView *)view;

改了一下之前的代码，使自定义的tableViewCell中的图片点击放大，再次点击图片缩小回到原位，首先看一下效果图：

下面贴上自定义的Cell代码，其他代码可以点击上面的文章连接查看：

#import 

@class HWCellModel;

@interface HWTableViewCell : UITableViewCell

@property (nonatomic, weak) UILabel *lable;
@property (nonatomic, strong) HWCellModel *model;

+ (instancetype)cellWIthTableView:(UITableView *)tableView;

@end


#import "HWTableViewCell.h"
#import "HWCellModel.h"

@interface HWTableViewCell ()

@property (nonatomic, weak) UIImageView *imgView;
@property (nonatomic, weak) UIImageView *imagView;
@property (nonatomic, weak) UILabel *subLabel;
@property (nonatomic, assign) CGRect lastFrame;

@end

@implementation HWTableViewCell

+ (instancetype)cellWIthTableView:(UITableView *)tableView
{
    //cell复用，唯一标识
    static NSString *identifier = @"HWCell";
    //先在缓存池中取
    HWTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
    //缓存池中没有再创建，并添加标识，cell移出屏幕时放入缓存池以复用
    if (cell == nil) {
        cell = [[HWTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
    }
    
    return cell;
}

//重写init方法构建cell内容
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) {
        //图片
        UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, 80, 60)];
        [imageView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapImageView:)]];
        imageView.userInteractionEnabled = YES;
        [self.contentView addSubview:imageView];
        self.imgView = imageView;
        
        //标题
        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(imageView.frame) + 10, 15, 200, 20)];
        label.font = [UIFont systemFontOfSize:20.0f];
        [self.contentView addSubview:label];
        self.lable = label;
        
        //副标题
        UILabel *subLabel = [[UILabel alloc] initWithFrame:CGRectMake(CGRectGetMaxX(imageView.frame) + 10, 40, 200, 13)];
        subLabel.font = [UIFont systemFontOfSize:13.0f];
        [self.contentView addSubview:subLabel];
        self.subLabel = subLabel;
        
        self.backgroundColor = [UIColor whiteColor];
    }
    
    return self;
}

//重写set方法，模型传递
- (void)setModel:(HWCellModel *)model
{
    _model = model;
    
    self.imgView.image = [UIImage imageNamed:model.image];
    self.lable.text = model.title;
    self.subLabel.text = model.subTitle;
}

- (void)tapImageView:(UITapGestureRecognizer *)recognizer
{
    //添加遮盖
    UIView *cover = [[UIView alloc] init];
    cover.frame = [UIScreen mainScreen].bounds;
    cover.backgroundColor = [UIColor clearColor];
    [cover addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapCover:)]];
    [[UIApplication sharedApplication].keyWindow addSubview:cover];
    
    //添加图片到遮盖上
    UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"hero"]];
    imageView.frame = [cover convertRect:recognizer.view.frame fromView:self];
    self.lastFrame = imageView.frame;
    [cover addSubview:imageView];
    self.imagView = imageView;
    
    //放大
    [UIView animateWithDuration:0.3f animations:^{
        cover.backgroundColor = [UIColor colorWithRed:0/255.0 green:0/255.0 blue:0/255.0 alpha:0.8];
        CGRect frame = imageView.frame;
        frame.size.width = cover.frame.size.width;
        frame.size.height = cover.frame.size.width * (imageView.image.size.height / imageView.image.size.width);
        frame.origin.x = 0;
        frame.origin.y = (cover.frame.size.height - frame.size.height) * 0.5;
        imageView.frame = frame;
    }];
}

- (void)tapCover:(UITapGestureRecognizer *)recognizer
{
    [UIView animateWithDuration:0.3f animations:^{
        recognizer.view.backgroundColor = [UIColor clearColor];
        self.imagView.frame = self.lastFrame;
        
    }completion:^(BOOL finished) {
        [recognizer.view removeFromSuperview];
        self.imagView = nil;
    }];
}

@end