无论我在分配时给它什么大小，它都只显示固定大小。有可能增加吗？代码:activityIndicator=[[UIActivityIndicatorViewalloc]initWithFrame:CGRectMake(142.00,212.00,80.0,80.0)];[[selfview]addSubview:activityIndicator];[activityIndicatorsizeToFit];activityIndicator.autoresizingMask=(UIViewAutoresizingFlexibleLeftMargin|UIViewAutoresizingF