Question

我想知道为什么我的委托方法

- (void)layoutManager:(NSLayoutManager *)layoutManager
didCompleteLayoutForTextContainer:(NSTextContainer *)textContainer
                atEnd:(BOOL)layoutFinishedFlag

未调用，我使用此代码：

self.storage = [[NSTextStorage alloc] initWithString:@"sdfsdf sdf sdf sdf sdf sdf Sdf sdf sdf "];
self.layout = [[NSLayoutManager alloc] init];
[self.storage addLayoutManager:self.layout];
self.layout.delegate = self;
NSTextContainer * container = [[NSTextContainer alloc] init];
[self.layout addTextContainer:container];

TextStorage和LayoutManager属性在类中强保留，但委托方法未调用!!!

Answer 1

在设置委托后修改NSTextStorage时将调用委托方法。这是来自UIViewController的片段：

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Answer 2

我发现在向UITextView添加任何容器时也会调用委托方法。

未调用NSLayoutManager Delegate

2 个答案: