我有一个简单的视图控制器，当点击链接按钮时，它呈现SFSafariViewController .
#import "ViewController.h"
#import "SafariDelegate.h"
@interface ViewController ()
@property(nonatomic, strong) NSString *url;
@property(nonatomic, weak) SafariDelegate *safariDelegate;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.url = @"http://www.google.com";
}
- (IBAction)linkTapped:(id)sender {
SFSafariViewController *vc = [[SFSafariViewController alloc] initWithURL:[NSURL URLWithString:self.url]];
SafariDelegate *safariDelegate = [[SafariDelegate alloc] init];
vc.delegate = safariDelegate;
[self presentViewController:vc animated:YES completion:nil];
}
@end
SafariDelegate符合SFSafariViewControllerDelegate，只是在委托方法触发时记录 .
SafariDelegate.h
#import <Foundation/Foundation.h>
#import <SafariServices/SafariServices.h>
@interface SafariDelegate : NSObject <SFSafariViewControllerDelegate>
@end
SafariDelegate.m
#import "SafariDelegate.h"
@implementation SafariDelegate
- (NSArray<UIActivity *> *)safariViewController:(SFSafariViewController *)controller activityItemsForURL:(NSURL *)URL title:(nullable NSString *)title
{
NSLog(@"safariViewController activityItemsForURL");
return @[];
}
- (void)safariViewControllerDidFinish:(SFSafariViewController *)controller
{
NSLog(@"safariViewControllerDidFinish");
}
- (void)safariViewController:(SFSafariViewController *)controller didCompleteInitialLoad:(BOOL)didLoadSuccessfully
{
NSLog(@"safariViewController didCompleteInitialLoad");
}
@end
当我点击按钮时，safariviewcontroller正确加载页面，但从不调用委托方法（包括当我点击'完成'时） . 我在显示'vc'的行处设置了一个断点并确认该委托在该点正确设置 . 我错过了什么？
1 回答
SafariViewController不保留其委托，因此在linkTapped:方法返回后立即取消分配，因为没有其他任何内容具有强引用 .你需要在某个地方保持对它的强烈引用 . 您可能只需将当前视图控制器中的属性更改为
strong并将其存储在那里 . 您还可以将其保存在safari视图控制器上的关联对象中 .