layoutSubviews在什麼情況下呼叫

###1.在以下情況都會呼叫

注意:當view的size的值為0的時候，addsubview也不會呼叫layoutsubviews。當要給這個view新增子控制項的時候不管他的size有沒有值都會呼叫

subview*view= [[subview alloc]initwithframe:cgrectmake(0,0,100,100)];

view.backgroundcolor=[uicolor redcolor];
[self.view addsubview:view];
self.sbview= view;

// 新增子控制項的時候都會呼叫

custombtn *button = [[custombtn alloc] init];[self.sbview addsubview:button];

- (void)viewdidload

custombtn*button = [[custombtn alloc]init];

[self.view addsubview:button];

}

custombtn*button = [[custombtn alloc] init];

[button settitle:@"xxoo" forstate:uicontrolstatenormal]; 
[self.view addsubview:button];

custombtn *button = [[custombtn alloc] init];

[button setimage:[uiimage imagenamed:@"xoxo"] forstate:uicontrolstatenormal];
[self.view addsubview:button];

// scrollview比較特殊

customscrollview *scrollview= [[customscrollview alloc]init];
[self.view addsubview:scrollview];

// 因為scrollview有size,所以會呼叫

customscrollview *scrollview= [[customscrollview alloc]initwithframe:cgrectmake(100,100,300,200)];
[self.view addsubview:scrollview];
scrollview.backgroundcolor= [uicolor yellowcolor];
scrollview.contentsize= cgsizemake(0,500);

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