- NSString
- CGRect
- class
- selector
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// 文字属性 NSMutableDictionary *attrs = [NSMutableDictionary dictionary]; attrs[NSFontAttributeName] = self.font; attrs[NSForegroundColorAttributeName] = self.placeholderColor; [@"要画的字符串" drawInRect:rect withAttributes:attrs]; }
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- CGRect
1.转换坐标系
//subview.superview的坐标转换成keyWindow的坐标。nil代表[[UIApplication sharedApplication].keyWindow
CGRect newFrame = [subview.superview convertRect:subview.frame toView:nil];
//等价上面
CGRect newFrame1 = [[UIApplication sharedApplication].keyWindow convertRect:subview.frame fromView:subview.superview];
2.frame是否有重叠
CGRectIntersectsRect(frame1, frame2);
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- class
-(BOOL) isKindOfClass: classObj判断是否是这个类或者这个类的子类的实例
-(BOOL) isMemberOfClass: classObj 判断是否是这个类的实例
isKindOfClass来确定一个对象是否是一个类的成员,或者是派生自该类的成员
isMemberOfClass只能确定一个对象是否是当前类的成员
NSLog(@"%d,%d", [[NSMutableData data] isKindOfClass:[NSData class]],[[NSMutableData data] isMemberOfClass:[NSData class]]);
打印:2016-04-03 10:39:03.623 01-xxx[1680:35179] 1,0
------------------------------------------------- - selector
-(BOOL) respondsToSelector: selector 判读实例是否有这样方法
+(BOOL) instancesRespondToSelector: 判断类是否有这个方法。此方法是类方法,不能用在类的对象