iOS11中tableview的左右滑动事件，iOS更新了左右滑动事件，新增添了两个方法，可以为事件自定义添加图片和标题。不过有点限制，就是图片和标题都会变成白色，不能显示原图和设置标题大小和颜色。效果如下
WechatIMG36.jpeg
WechatIMG37.jpeg
进入tableview的delegate中我们可以看到增加了两个代理方法
// Swipe actions
// These methods supersede -editActionsForRowAtIndexPath: if implemented
// return nil to get the default swipe actions
- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView leadingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath API_AVAILABLE(ios(11.0)) API_UNAVAILABLE(tvos);
- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath API_AVAILABLE(ios(11.0)) API_UNAVAILABLE(tvos);
一个是左划代理事件，另一个是右划代理事件
同时还增加了两个类，其中UIContextualAction是事件，UISwipeActionsConfiguration是滑动事件设置。是代理中的返回值。
UISwipeActionsConfiguration
UIContextualAction
-
UIContextualAction 事件的类比较简单,可以看到只有一个类的实例化方法，一个style设置类型，一个title，backgroundcolor，一个image就没有了。
WechatIMG38.jpeg
-
UISwipeActionsConfiguration 就更简单了,一个类实例化方法加一个全滑动事件，performsFirstActionWithFullSwipe设置cell全划的时候自动响应活动事件，默认是true，自动响应。
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最后看看实现的代码
1.右划
#ifdef __IPHONE_11_0
- (nullable UISwipeActionsConfiguration *)tableView:(UITableView *)tableView leadingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (@available(iOS 11.0, *)) {
UIContextualAction *deleteRowAction = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal title:@"删除" handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
//响应事件在这里操作
}];
//设置图片，但是设置不了原图，都是被默认为白色了，字体也是
UIImage *image = [[UIImage imageNamed:@"ico_delete"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
[deleteRowAction setImage:image];
deleteRowAction.backgroundColor = [UIColor redColor];
UIContextualAction *editRowAction = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal title:@"编辑" handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
//响应事件在这里操作
}];
editRowAction.image = [UIImage imageNamed:@"ico_edit"];
editRowAction.backgroundColor = [UIColor blueColor];
UISwipeActionsConfiguration *config = [UISwipeActionsConfiguration configurationWithActions:@[deleteRowAction,editRowAction]];
//设置全屏滑动时不自定响应事件
config.performsFirstActionWithFullSwipe = false;
return config;
}else{
return nil;
}
}
2.左划
- ( UISwipeActionsConfiguration *)tableView:(UITableView *)tableView trailingSwipeActionsConfigurationForRowAtIndexPath:(NSIndexPath *)indexPath {
if (@available(iOS 11.0, *)) {
UIContextualAction *deleteRowAction = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal title:@"删除" handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
}];
UIImage *image = [[UIImage imageNamed:@"ico_delete"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
[deleteRowAction setImage:image];
deleteRowAction.backgroundColor = [UIColor redColor];
UIContextualAction *editRowAction = [UIContextualAction contextualActionWithStyle:UIContextualActionStyleNormal title:@"编辑" handler:^(UIContextualAction * _Nonnull action, __kindof UIView * _Nonnull sourceView, void (^ _Nonnull completionHandler)(BOOL)) {
}];
editRowAction.image = [UIImage imageNamed:@"ico_edit"];
editRowAction.backgroundColor = [UIColor blueColor];
UISwipeActionsConfiguration *config = [UISwipeActionsConfiguration configurationWithActions:@[deleteRowAction,editRowAction]];
config.performsFirstActionWithFullSwipe = false;
return config;
}else{
return nil;
}
}
PS
那么我们想有没有方法改变图标的颜色的字体颜色大小呢。
用runtime获取一下UIContextualAction的所有属性看看有哪些。
unsigned int count = 0;
Ivar *list = class_copyIvarList([UIContextualAction class], &count1);
for (int i = 0; i < count; i ++) {
Ivar item = list[I];
NSString *name = [NSString stringWithUTF8String:ivar_getName(item)];
NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(item)];
NSLog(@"name = %@ type = %@",name,type);
}
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明显的没有我们想要的UIImageView和UILabel，说明UIContextualAction并没有直接持有他们作为属性。用KVC的方法获取不到，自然也就改不了。
iOS11之前的左右划事件
iOS11之前默认的划动事件是不能直接设置图标的，只能设置标题和背景颜色。先看看效果
421510554670_.pic_hd.jpg
实现一样很简单，实现delegate中的方法即可，如下
- (nullable NSArray<UITableViewRowAction *> *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewRowAction *delete = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDestructive title:@"删除" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {
//响应事件在这里操作
}];
delete.backgroundColor = [UIColor redColor];
UITableViewRowAction *edit = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDestructive title:@"编辑" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {
//响应事件在这里操作
}];
edit.backgroundColor = [UIColor blueColor];
return @[delete,edit];
}
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我们看看事件的响应UITableViewRowAction里面的属性有什么，同样的用runtime获取一遍所有的属性
unsigned int count = 0;
Ivar *list = class_copyIvarList([UITableViewRowAction class], &count);
for (int i = 0; i < count; i ++) {
Ivar item = list[I];
NSString *name = [NSString stringWithUTF8String:ivar_getName(item)];
NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(item)];
NSLog(@"name = %@ type = %@",name,type);
}
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从log中我们可以看到，在事件UITableViewRowAction中有个button的属性，类型是UITableViewCellActionButton类型。这就是我们所需要的做文章的view了。经过探究，这个button是在实例化UITableViewRowAction之后内部实例化的，我们用一个KVC获取到该button，然后自定一个我们想要的效果，贴在该button上面即可，注意的是：获取该button时不能直接获取，需要在事件UITableViewRowAction实例化后延时零点几秒之后才能获取得到
实现代码如下
- (nullable NSArray<UITableViewRowAction *> *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewRowAction *delete = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDestructive title:@"删除" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {
}];
delete.backgroundColor = [UIColor grayColor];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
/*
unsigned int count = 0;
Ivar *list = class_copyIvarList([UITableViewRowAction class], &count);
for (int i = 0; i < count; i ++) {
Ivar item = list[i];
NSString *name = [NSString stringWithUTF8String:ivar_getName(item)];
NSString *type = [NSString stringWithUTF8String:ivar_getTypeEncoding(item)];
NSLog(@"name = %@ type = %@",name,type);
}*/
//用KVC获取该button
UIControl *baseView = [delete valueForKey:@"_button"];
//自定义一个view加作为subview加在button上面即可实现
UIView *custom = [[UIView alloc] initWithFrame:baseView.bounds];
custom.backgroundColor = [UIColor lightGrayColor];
custom.userInteractionEnabled = NO;
UIImageView *icon = [[UIImageView alloc] initWithFrame:CGRectMake((custom.frame.size.width - 30)/2, custom.frame.size.height/2 - 30, 30, 30)];
icon.image = [UIImage imageNamed:@"ico_delete"];
icon.contentMode = UIViewContentModeCenter;
[custom addSubview:icon];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, custom.frame.size.height/2 + 5, custom.frame.size.width, 20)];
label.text = @"删除";
label.font = [UIFont systemFontOfSize:14];
label.textAlignment = NSTextAlignmentCenter;
[custom addSubview:label];
[baseView addSubview:custom];
});
UITableViewRowAction *edit = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDestructive title:@"编辑" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {
}];
edit.backgroundColor = [UIColor grayColor];
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.01 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
UIControl *baseView = [edit valueForKey:@"_button"];
UIView *custom = [[UIView alloc] initWithFrame:baseView.bounds];
custom.backgroundColor = [UIColor lightGrayColor];
custom.userInteractionEnabled = NO;
UIImageView *icon = [[UIImageView alloc] initWithFrame:CGRectMake((custom.frame.size.width - 30)/2, custom.frame.size.height/2 - 30, 30, 30)];
icon.image = [UIImage imageNamed:@"ico_edit"];
icon.contentMode = UIViewContentModeCenter;
[custom addSubview:icon];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, custom.frame.size.height/2 + 5, custom.frame.size.width, 20)];
label.text = @"编辑";
label.font = [UIFont systemFontOfSize:14];
label.textAlignment = NSTextAlignmentCenter;
[custom addSubview:label];
[baseView addSubview:custom];
});
return @[delete,edit];
}
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