成员访问不完整类型"CALayer"的权限

问题描述

对于以下代码:

CGRect frame = CGRectMake(0, 0, cellWidth, 240);
MKMapView *mapView = [[MKMapView alloc] initWithFrame:frame];

mapView.layer.masksToBounds = YES;
mapView.layer.cornerRadius = 10.0;

我还包括了MapKit，QuartzCore和CoreLocation框架.对于最后两行，我收到错误消息:对不完整类型'CALayer'的成员访问"

I included MapKit,QuartzCore and CoreLocation Frameworks in addition.For the last 2 lines, I am getting error : "Member access into incomplete type 'CALayer'"

请告诉我为什么会出现此错误以及如何解决此问题

Please tell me why I get this error and how to resolve this

因为没有导入Quartz.h，所以出现了此错误，但是我仍然不明白为什么它说CALayer类型的不完整性.任何人都可以深入探讨这个问题.

I got this error as I did not import Quartz.h, but i still dont understand why its saying incompleteness of CALayer type. Can anyone throw some light into depth of this.

谢谢

推荐答案

您是否: #import< QuartzCore/QuartzCore.h> ?

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