主要还是 CGRect，其余都是辅助。
CGPoint 点（位置）
struct CGPoint {
CGFloat x;
CGFloat y;
}; CGPoint aPoint = {100,200};
// 一般方法
CGPoint point = CGPointMake(100, 200);
CGPoint zeroPoint = CGPointZero;
BOOL isequal = CGPointEqualToPoint(point, zeroPoint);
CGSize 大小
struct CGSize {
CGFloat width;
CGFloat height;
}; CGSize aSize = {100,200};
//一般方法
CGSize size = CGSizeMake(100, 200);
CGSize zeroSize = CGSizeZero;
BOOL isequal = CGSizeEqualToSize(size, zeroSize);
CGVector 矢量（偏移）
struct CGVector {
CGFloat dx;
CGFloat dy;
}; CGVector aVector = {20,40};
// 一般方法
CGVector vector = CGVectorMake(20, 40);
CGRect 位置 + 大小
- 创建
struct CGRect {
CGPoint origin;
CGSize size;
}; CGRect aRect = {{100,200},{120,240}};
CGRect rect = CGRectMake(100, 200, 120, 240);
CGRect zeroRect = CGRectZero;
CGRect nullRect = CGRectNull;
CGRect infiniteRect = CGRectInfinite;// 无穷大
- 获取属性
相比 self.view.frame.size.width 获取宽方便不少！
CGFloat minX = CGRectGetMinX(aRect);// == aRect.origin.x;
CGFloat minY = CGRectGetMinY(aRect);// == aRect.origin.y;
CGFloat maxX = CGRectGetMaxX(aRect);// == aRect.origin.x + aRect.size.width;
CGFloat maxY = CGRectGetMaxY(aRect);// == aRect.origin.y + aRect.size.height;
CGFloat midX = CGRectGetMidX(aRect);// == aRect.origin.x + aRect.size.width / 2;
CGFloat midY = CGRectGetMidY(aRect);// == aRect.origin.y + aRect.size.height / 2;
CGFloat width = CGRectGetWidth(aRect); // == aRect.size.width;
CGFloat height = CGRectGetHeight(aRect);// == aRect.size.height;
- 判断
BOOL isEqual = CGRectEqualToRect(aRect, bRect);
BOOL isEmpty = CGRectIsEmpty(aRect);
BOOL isNull = CGRectIsNull(aRect);
BOOL isInfinite = CGRectIsInfinite(aRect);// 无穷大
BOOL isIntersect = CGRectIntersectsRect(aRect, bRect);// 相交
BOOL iscontainPoint = CGRectContainsPoint(aRect, aPoint);
BOOL iscontainRect = CGRectContainsRect(aRect, bRect);
- 处理
在重写控件rect 时，很好用。
CGRectIntegral(aRect);// 转换成 整数
CGRectUnion(aRect, bRect);// 并集
CGRectIntersection(aRect, bRect);// 交集
CGRectInset(aRect, 10, 20);// 中心不变，水平，竖直方向，两边各向内调整（负值向外）
CGRectOffset(aRect, 10, 20);// (0,0)开始偏移，只变化了point 不变size
CGRectStandardize(aRect);// 宽高负数时调整成标准的 ：例如{{100,100}，{-90,-80}} ==》 {{10,20},{90,80}}
- 分割
typedef CF_ENUM(uint32_t, CGRectEdge) {
CGRectMinXEdge, CGRectMinYEdge, CGRectMaxXEdge, CGRectMaxYEdge
};// 切割 起始位置
CGRect rect =CGRectMake(100,100, 200,300);
CGRect slice;// 切掉
CGRect remainder;// 剩下
CGRectDivide(rect, &slice, &remainder,40, CGRectMaxYEdge);// 最后的参数：以哪边开始算起 amount 的 数值，切掉。
UIView *view1 = [[UIView alloc]initWithFrame:slice];
view1.backgroundColor = [UIColor redColor];
[self.view addSubview:view1];
UIView *view2 = [[UIView alloc]initWithFrame:remainder];
view2.backgroundColor = [UIColor greenColor];;
[self.view addSubview:view2];
其他
CFDictionaryRef 相关 暂无研究
/*** Persistent representations. ***/
/* Return a dictionary representation of `point'. */
CG_EXTERN CFDictionaryRef CGPointCreateDictionaryRepresentation(
CGPoint point)
CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
/* Make a CGPoint from the contents of `dict' (presumably returned earlier
from `CGPointCreateDictionaryRepresentation') and store the value in
`point'. Returns true on success; false otherwise. */
CG_EXTERN bool CGPointMakeWithDictionaryRepresentation(
CFDictionaryRef __nullable dict, CGPoint * __nullable point)
CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
/* Return a dictionary representation of `size'. */
CG_EXTERN CFDictionaryRef CGSizeCreateDictionaryRepresentation(CGSize size)
CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
/* Make a CGSize from the contents of `dict' (presumably returned earlier
from `CGSizeCreateDictionaryRepresentation') and store the value in
`size'. Returns true on success; false otherwise. */
CG_EXTERN bool CGSizeMakeWithDictionaryRepresentation(
CFDictionaryRef __nullable dict, CGSize * __nullable size)
CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
/* Return a dictionary representation of `rect'. */
CG_EXTERN CFDictionaryRef CGRectCreateDictionaryRepresentation(CGRect)
CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
/* Make a CGRect from the contents of `dict' (presumably returned earlier
from `CGRectCreateDictionaryRepresentation') and store the value in
`rect'. Returns true on success; false otherwise. */
CG_EXTERN bool CGRectMakeWithDictionaryRepresentation(
CFDictionaryRef __nullable dict, CGRect * __nullable rect)
CG_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
