iOS开发 ☞ 各种CG结构体

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1、CGRectInset(<#CGRect rect#>, <#CGFloat dx#>, <#CGFloat dy#>)
中心相同

CG_EXTERN CGRect CGRectInset(CGRect rect, CGFloat dx, CGFloat dy)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

UIView *view = [[UIView alloc] init];    view.frame = CGRectMake(100, 100, 100, 100);    view.backgroundColor = [UIColor orangeColor];    UIView *otherView = [[UIView alloc] init];    otherView.frame = CGRectInset(view.frame, 2, 4);    otherView.backgroundColor = [UIColor yellowColor];    [self.view addSubview:view];    [self.view addSubview:otherView];

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2、CGRectOffset(<#CGRect rect#>, <#CGFloat dx#>, <#CGFloat dy#>)
位置不同

CG_EXTERN CGRect CGRectOffset(CGRect rect, CGFloat dx, CGFloat dy)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

UIView *view = [[UIView alloc] init];    view.frame = CGRectMake(100, 100, 100, 100);    view.backgroundColor = [UIColor purpleColor];    UIView *otherView = [[UIView alloc] init];    otherView.frame = CGRectOffset(view.frame, 2, 4);    otherView.backgroundColor = [UIColor yellowColor];    [self.view addSubview:view];    [self.view addSubview:otherView];

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3、CGRectGetMidY(<#CGRect rect#>) 、 CGRectGetMidX(<#CGRect rect#>)
获取中心点坐标

    CG_EXTERN CGFloat CGRectGetMidX(CGRect rect)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);    CG_EXTERN CGFloat CGRectGetMidY(CGRect rect)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

UIView *view = [[UIView alloc] init];    view.frame = CGRectMake(100, 100, 100, 100);    view.backgroundColor = [UIColor purpleColor];    UIView *otherView = [[UIView alloc] init];    otherView.frame = CGRectOffset(view.frame, 2, 4);    otherView.backgroundColor = [UIColor yellowColor];    CGFloat centerX = CGRectGetMidX(view.frame);    CGFloat centerY = CGRectGetMidX(view.frame);    NSLog(@"%f",centerX);    NSLog(@"%f",centerY);    [self.view addSubview:view];    [self.view addSubview:otherView];

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4、CGRectIntersectsRect(<#CGRect rect1#>, <#CGRect rect2#>)
是否相交

In English,intersect means 交集

CG_EXTERN bool CGRectIntersectsRect(CGRect rect1, CGRect rect2)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

    UIView *view = [[UIView alloc] init];    view.frame = CGRectMake(100, 100, 100, 100);    view.backgroundColor = [UIColor purpleColor];    UIView *otherView = [[UIView alloc] init];    otherView.frame = CGRectOffset(view.frame, 2, 4);    otherView.backgroundColor = [UIColor yellowColor];    [self.view addSubview:view];    [self.view addSubview:otherView];    BOOL isIntersect =  CGRectIntersectsRect(view.frame, otherView.frame);    NSLog(@"%d",isIntersect);

5、CGRectIntersection(<#CGRect r1#>, <#CGRect r2#>)
相交区域

CG_EXTERN CGRect CGRectIntersection(CGRect r1, CGRect r2)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

UIView *view = [[UIView alloc] init];    view.frame = CGRectMake(100, 100, 100, 100);    view.backgroundColor = [UIColor purpleColor];    UIView *otherView = [[UIView alloc] init];    otherView.frame = CGRectOffset(view.frame, 2, 4);    otherView.backgroundColor = [UIColor yellowColor];    [self.view addSubview:view];    [self.view addSubview:otherView];    CGRect rect = CGRectIntersection(view.frame, otherView.frame);    NSLog(@"%@",NSStringFromCGRect(rect));    UIView *intersectView = [[UIView alloc] init];    intersectView.frame = rect;    intersectView.backgroundColor = [UIColor redColor];    [self.view addSubview:intersectView];

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6、CGRectIsNull(<#CGRect rect#>)
是否为空

CG_EXTERN bool CGRectIsNull(CGRect rect)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

UIView *view = [[UIView alloc] init];    view.frame = CGRectMake(100, 100, 100, 100);    view.backgroundColor = [UIColor orangeColor];    [self.view addSubview:view];    UIView *view1 = [[UIView alloc] init];    view1.frame = CGRectMake(100, 150, 100, 100);    view.backgroundColor = [UIColor yellowColor];    [self.view addSubview:view1];    CGRect intersectRect = CGRectIntersection(view.frame, view1.frame);    //0说明有交集    NSLog(@"%d",CGRectIsNull(intersectRect));

7、CGRectEqualToRect(<#CGRect rect1#>, <#CGRect rect2#>)
判断两个矩形是否相同，包括位置和形状

CG_EXTERN bool CGRectEqualToRect(CGRect rect1, CGRect rect2)    CG_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

2016年12月21日更新

iOS中的坐标转换：
经常遇到的需求是把cell上的子视图的坐标转为窗口的坐标，我们需要的转换如下：
[cell convertPoint:tmpImage.center toView:destinationView] 这里的cell的位置不能传入子视图的坐标，需要注意一下。

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