在viewController

Question

self.one=[[SSone alloc] init];
[self addChildViewController:self.one];
[self.view addSubview:self.one.view];

当程序执行 [self.view addSubview：self.one.view] 时，出现问题。当我输入'po self.one.view'时，结果是

(lldb) po self.one.view error: Execution was interrupted, reason: 
EXC_BAD_ACCESS (code=2, address=0x7fff57e94ff8).
The process has been returned to the state before expression evaluation.

Answer 1

在致电[self.view addSubview:self.one.view];之前，您必须致电：

[self.one didMoveToParentViewController:self];