相关疑难解决方法(0)

我需要阻止.但编译器会发出警告

"在这个区块强势捕捉'自我'可能会导致保留周期"

__weak typeof(self) weakSelf = self;
[generalInstaImage setImageWithURLRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:data[@"images"][@"low_resolution"][@"url"]]] placeholderImage:[UIImage imageNamed:@"Default"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
    NSLog(@"success");
    [generalInstaImage setImage: image];
    [weakSelf saveImage:generalInstaImage.image withName:data[@"id"]];

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
        NSLog(@"fail");
}];

我尝试编写类似的例子weakSelf.generalInstaImage,但编译器生成错误而不编译.

Rob为子类化NSOperation 提供了一个很好的Objective-C解决方案,以实现SKAction对象的串行排队机制.我在自己的Swift项目中成功实现了这一点.

import SpriteKit

class ActionOperation : NSOperation
{
    let _node: SKNode // The sprite node on which an action is to be performed
    let _action: SKAction // The action to perform on the sprite node
    var _finished = false // Our read-write mirror of the super's read-only finished property
    var _executing = false // Our read-write mirror of the super's read-only executing property

    /// Override read-only superclass property as read-write.
    override var executing: Bool {
        get …