问题描述:
This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release.
问题代码 ：
func loadImage(imageURL:String){
print("image url->",imageURL)
let url = NSURL(string: imageURL)
let data = try? NSData(contentsOfURL: url!, options: NSDataReadingOptions.DataReadingMappedIfSafe)
let image = UIImage(data: data!)
self.images.append(image)
}
因为执行
NSData(contentsOfURL: url!, options: NSDataReadingOptions.DataReadingMappedIfSafe)
会阻塞主进程，因此我们需要自行异步调用此方法来解决问题
改成下面的样子后就好了
因为是一组图片，所以我们增加一个异步加载队列组来管理加载
func loadImages(images:[String]) {
let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
let queueGroup = dispatch_group_create()
dispatch_group_async(queueGroup, queue, {
for imageURL in images{
self.loadImage(imageURL)
}
})
dispatch_group_notify(queueGroup, dispatch_get_main_queue(), {
//将加载完成后的图片添加到视图
self.addImages()
})
}
func loadImage(imageURL:String){
print("image url->",imageURL)
let url = NSURL(string: imageURL)
let data = try? NSData(contentsOfURL: url!, options: NSDataReadingOptions.DataReadingMappedIfSafe)
let image = UIImage(data: data!)
self.images.append(image!)
}
更具体的线程讲解可以参考这篇文章或者自行搜索
http://blog.csdn.net/totogo2010/article/details/8016129
