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@interface GJCell : UITableViewCell

@property (nonatomic, weak) UIImageView *customImageView;
@property (nonatomic, weak) UILabel *title;
@property (nonatomic, weak) UILabel *subtitle;

@end

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#import "GJCell.h"
#import "Masonry.h"

static NSString * const GJCellIndentifier = @"GJCell";

@interface ViewController () <UITableViewDataSource, UITableViewDelegate>

@property (nonatomic, strong) NSArray *datas;
@property (nonatomic, weak) UITableView *tableView;

@end

@implementation ViewController

#pragma mark - Life Cycle

- (void)viewDidLoad {
[super viewDidLoad];

[self setupData];

[self setupView];
}

- (void)setupData {
NSDictionary *data1 = @{@"icon": @"myIcon",
@"name": @"GJBlog",
@"content": @"今天天气真好啊"};

NSDictionary *data2 = @{@"icon": @"myIcon",
@"name": @"GJBlogGJBlogGJBlog",
@"content": @"今天天气真好啊今天天气真好啊今天天气真好啊今天天气真好啊"};

NSDictionary *data3 = @{@"icon": @"myIcon",
@"name": @"GJBlogGJBlogGJBlogGJBlogGJBlog",
@"content": @"今天天气真好啊今天天气真好啊今天天气真好啊今天天气真好啊今天天气真好啊今天天气真好啊今天天气真好啊"};

self.datas = @[data1, data2, data3];
}

- (void)setupView {
UITableView *tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
[tableView registerClass:[GJCell class] forCellReuseIdentifier:GJCellIndentifier];
tableView.dataSource = self;
tableView.delegate = self;
[self.view addSubview:tableView];
self.tableView = tableView;

[tableView mas_makeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self.view);
}];
}

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#import "GJCell.h"
#import "Masonry.h"

@implementation GJCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier {
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
[self setupView];

[self setupConstraint];
}
return self;
}

- (void)setupView {

UIImageView *customImageView = [[UIImageView alloc] init];
customImageView.layer.cornerRadius = 15.0f;
customImageView.layer.masksToBounds = YES;
[self.contentView addSubview:customImageView];
_customImageView = customImageView;

// 重点1
CGFloat preferredWidth = [UIScreen mainScreen].bounds.size.width - 75;

UILabel *title = [[UILabel alloc] init];
title.numberOfLines = 0;
// 重点1
title.preferredMaxLayoutWidth = preferredWidth;
title.textColor = [UIColor grayColor];
[self.contentView addSubview:title];
_title = title;

UILabel *subtitle = [[UILabel alloc] init];
subtitle.numberOfLines = 3;
// 重点1
subtitle.preferredMaxLayoutWidth = preferredWidth;
[self.contentView addSubview:subtitle];
_subtitle = subtitle;
}

- (void)setupConstraint {
[self.customImageView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.contentView).with.offset(15.0f);
make.right.equalTo(self.title.mas_left).with.offset(-15.0f);
make.left.equalTo(self.contentView).with.offset(15.0f);
make.size.mas_equalTo(CGSizeMake(30.0f, 30.0f));
}];

[self.title mas_makeConstraints:^(MASConstraintMaker *make) {
// 重点2
make.top.equalTo(self.contentView).with.offset(20.0f).with.priority(751);
make.right.equalTo(self.contentView).with.offset(-15.0f);
}];

[self.subtitle mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(self.title.mas_bottom).with.offset(15.0f);
make.right.equalTo(self.title);
make.bottom.equalTo(self.contentView).with.offset(-15.0f).with.priority(749);
make.left.equalTo(self.title);
}];
}

@end

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#pragma mark - UITableViewDataSource

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 60;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
GJCell *cell = [tableView dequeueReusableCellWithIdentifier:GJCellIndentifier forIndexPath:indexPath];
[self configureCell:cell atIndexPath:indexPath];
return cell;
}

- (void)configureCell:(GJCell *)cell atIndexPath:(NSIndexPath *)indexPath {
NSInteger row = indexPath.row % 3;
NSDictionary *data = self.datas[row];

UIImage *image = [UIImage imageNamed:data[@"icon"]];
[cell.customImageView setImage:image];

[cell.title setText:data[@"name"]];

[cell.subtitle setText:data[@"content"]];
}

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#pragma mark - UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return [self heightForCellAtIndexPath:indexPath];
}

- (CGFloat)heightForCellAtIndexPath:(NSIndexPath *)indexPath {
static GJCell *cell = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
cell = [self.tableView dequeueReusableCellWithIdentifier:GJCellIndentifier];
});
[self configureCell:cell atIndexPath:indexPath];
return [self calculateHeightForCell:cell];
}

- (CGFloat)calculateHeightForCell:(GJCell *)cell {
[cell setNeedsLayout];
[cell layoutIfNeeded];
CGSize size = [cell.contentView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
return size.height + 1.0f;
}

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#pragma mark - UITableViewDelegate

- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 112.0f;
}