Block 测试

@WeakObj(self);
// _testBlock相当于self.testBlock
_testBlock = ^() {
    selfWeak.view.backgroundColor = [UIColor yellowColor];
};
// 单例不会导致循环引用，但是有延迟的话会导致dealloc不能及时调用
[[ShareManager inst] hello:^{
    selfWeak.detailDescriptionLabel.text = @"hi";
}];

self.chirdView = [[DetailChirdView alloc] initWithFrame:self.view.bounds];
self.chirdView.backgroundColor = [UIColor purpleColor];
[self.view addSubview:self.chirdView];
// 方法名不会导致循环引用，但是有延迟的话会导致dealloc不能及时调用
[self.chirdView backgroundDidTap:^{
    selfWeak.view.backgroundColor = [UIColor yellowColor];
    selfWeak.chirdView.backgroundColor = [UIColor blackColor];
}];
// 属性Xcode就会提示循环引用，所以要用weak
self.chirdView.touchBeginCb = ^{
    selfWeak.view.backgroundColor = [UIColor yellowColor];
};