我正在进行swift4迁移,并出现此警告(这使我的应用程序非常慢)。
同时访问0x10f10df48,但修改需要独占访问。
在线
else if (context == &KVOContext && keyPath == contentSizeKeyPath && object as? UIScrollView == scrollView) {
找不到如何解决它。
答案 0 :(得分:1)
https://github.com/apple/swift-evolution/blob/master/proposals/0176-enforce-exclusive-access-to-memory.md 在此链接中,您可以看到& KVOContext
的冲突 像这样:// CONFLICT. Passing 'x' as an inout argument is a write access for the
// duration of the call. Passing the same variable twice means performing
// two overlapping write accesses to that variable, which therefore conflict.
swap(&x, &x)
extension Int {
mutating func assignResultOf(_ function: () -> Int) {
self = function()
}
}
我通过
解决了这个问题struct Pair {
var x: Int
var y: Int
}
class Paired {
var pair = Pair(x: 0, y: 0)
}
let object = Paired()
swap(&object.pair.x, &object.pair.y)
我的代码是
class Paired {
var pair = Pair(x : "PullToRefreshKVOContext")
}
let objects = Paired()
override open func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
if (context == &objects.pair.x && keyPath == contentOffsetKeyPath && object as? UIScrollView == scrollView) {
...
}