iOS Programming Views :Redrawing and UIScrollView

iOS Programming Views :Redrawing and UIScrollView 

1.1 event 

You are going to see how views are redrawn in response to an event.

你将看到view如何响应event的。

You declared properties in header files. You can also declare properties in class extensions.

你可以声明属性在header文件，也可以声明在class extensions中。

#import "BNRHypnosisView.h"

@interface BNRHypnosisView ()

@property (strong, nonatomic) UIColor *circleColor;

@end

@implementation BNRHypnosisView

These three lines of code are a class extension with one property declaration.

有三行代码在一个类扩展中。

When the user touches a view, the view is sent the message touchesBegan:withEvent:.

当用户触摸一个view 时，这个view将会发送消息给tochesBegan:withEvent:

Override touchesBegan:withEvent: to change the circleColor property of the view to a random color.

重写touchesBegan:withEvent方法

// When a finger touches the screen

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原标题：iOS Programming Views :Redrawing and UIScrollView

关键词：IOS