iOS 13适配

iOS13中presentViewController的问题

更新了Xcode11.0 beta之后，在iOS13中运行代码发现presentViewController和之前弹出的样式不一样。

image

会出现这种情况是主要是因为我们之前对UIViewController里面的一个属性，即modalPresentationStyle（该属性是控制器在模态视图时将要使用的样式）没有设置需要的类型。在iOS13中modalPresentationStyle的默认改为UIModalPresentationAutomatic,而在之前默认是UIModalPresentationFullScreen

/*
 Defines the presentation style that will be used for this view controller when it is presented modally. Set this property on the view controller to be presented, not the presenter.
 If this property has been set to UIModalPresentationAutomatic, reading it will always return a concrete presentation style. By default UIViewController resolves UIModalPresentationAutomatic to UIModalPresentationPageSheet, but other system-provided view controllers may resolve UIModalPresentationAutomatic to other concrete presentation styles.
 Defaults to UIModalPresentationAutomatic on iOS starting in iOS 13.0, and UIModalPresentationFullScreen on previous versions. Defaults to UIModalPresentationFullScreen on all other platforms.
 */
@property(nonatomic,assign) UIModalPresentationStyle modalPresentationStyle API_AVAILABLE(ios(3.2));

要改会原来模态视图样式，我们只需要把UIModalPresentationStyle设置为UIModalPresentationFullScreen即可

ViewController *vc = [[ViewController alloc] init];
vc.title = @"presentVC";
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
nav.modalPresentationStyle = UIModalPresentationFullScreen;
[self.window.rootViewController presentViewController:nav animated:YES completion:nil];

私有KVC

在使用iOS 13运行项目时突然APP就crash掉了。定位到的问题是在设置UITextField的Placeholder也就是占位文本的颜色和字体时使用了KVC的方法：

[_textField setValue:[UIColor redColor] forKeyPath:@"_placeholderLabel.textColor"];
[_textField setValue:[UIFont systemFontOfSize:14] forKeyPath:@"_placeholderLabel.font"];

可以将其替换为

_textField.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"姓名" attributes:@{NSFontAttributeName:[UIFont systemFontOfSize:14],NSForegroundColorAttributeName:[UIColor redColor]}];

并且只需要在初始化的时候设置attributedPlaceholder即富文本的占位文本，再重新赋值依然使用placeolder直接设置文本内容，样式不会改变

iOS 13 DeviceToken有变化

NSString *dt = [deviceToken description];
dt = [dt stringByReplacingOccurrencesOfString: @"<" withString: @""];
dt = [dt stringByReplacingOccurrencesOfString: @">" withString: @""];
dt = [dt stringByReplacingOccurrencesOfString: @" " withString: @""];
这段代码运行在 iOS 13 上已经无法获取到准确的DeviceToken字符串了，iOS 13 通过[deviceToken description]获取到的内容已经变了。

解决方法：

- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken
{
    if (![deviceToken isKindOfClass:[NSData class]]) return;
    const unsigned *tokenBytes = [deviceToken bytes];
    NSString *hexToken = [NSString stringWithFormat:@"%08x%08x%08x%08x%08x%08x%08x%08x",
                          ntohl(tokenBytes[0]), ntohl(tokenBytes[1]), ntohl(tokenBytes[2]),
                          ntohl(tokenBytes[3]), ntohl(tokenBytes[4]), ntohl(tokenBytes[5]),
                          ntohl(tokenBytes[6]), ntohl(tokenBytes[7])];
    NSLog(@"deviceToken:%@",hexToken);
}

MPMoviePlayerController 在iOS 13已经不能用了

既然不能再用了，那只能换掉了。替代方案就是AVKit里面的那套播放器

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参考文章：

iOS13 适配踩坑