ios CGRec用法

   /*
     rect(x,y,width,height);
     width， height正负代表了从原点的绘制方向,矩形的长宽都是取得绝对值
     */
    
    
    // Do any additional setup after loading the view, typically from a nib.
#pragma mark -------------------------------------------生成CGRect---------------------------------------
    CGRect originalRect = CGRectMake(80.44, 30.66, 100.77, 95.88);
    NSLog(@"originalRect = %@",NSStringFromCGRect(originalRect));

    // CGRectInfinite 用法
    /*
     生成无穷大矩形
     */
    NSLog(@"infiniteRect = %@",NSStringFromCGRect(CGRectInfinite));
    
    // CGRectNull 用法
    NSLog(@"nullRect = %@",NSStringFromCGRect(CGRectNull));
    
    //CGRectZero 用法
    /*
     CGRectMake(0, 0, 0, 0)
     */
    NSLog(@"zeroRect = %@",NSStringFromCGRect(CGRectZero));
    
    // CGRectInset 用法
    CGRect insetRect = CGRectInset(originalRect, 1, 2);
    /*
     CGRectInset(originalRect, dx, dy);
    insetRect.origin.x = originalRect.origin.x + dx ;
    insetRect.origin.y = originalRect.origin.y + dy;
    insetRect.size.width = originalRect.size.width - 2 * dx;
    insetRect.size.height = originalRect.size.height - 2 * dy;
     */
    NSLog(@"insetRect = %@",NSStringFromCGRect(insetRect));
    
    //CGRectOffset 用法
    CGRect offsetRect = CGRectOffset(originalRect, -1, -2);
    /*
     CGRectOffset(originalRect, dx, dy);
     insetRect.origin.x = originalRect.origin.x + dx ;
     insetRect.origin.y = originalRect.origin.y + dy;
     insetRect.size.width = originalRect.size.width;
     insetRect.size.height = originalRect.size.height;
     */
    NSLog(@"offsetRect = %@",NSStringFromCGRect(offsetRect));
    
    //CGRectIntegral 用法
    /*
     将origin值向下调整到最近整数，size向上调整到最近整数，使生成的CGRect可以完全包含原来的CGRect.
     */
    CGRect integralRect = CGRectIntegral(originalRect);
    NSLog(@"integralRect = %@",NSStringFromCGRect(integralRect));
    
    //CGRectStandardize 用法
    /*
     CGRectStandardize(testRect)
     standardizeRect.size.width = fabsf(testRect.size.width)//testRect.size.width 的绝对值
     standardizeRect.size.height = fabsf(testRect.size.height)//testRect.size.height 的绝对值
     */
    CGRect testRect = CGRectMake(-5.5, -6.6, -7.7, -8.8);
    CGRect standardizeRect = CGRectStandardize(testRect);
    NSLog(@"standardizeRect = %@",NSStringFromCGRect(standardizeRect));
    
    //CGRectUnion 用法
    /*
     CGRectUnion(rect1,rect2) 返回值是能够包含两个矩形的最小矩形
     unionResultRect.origin.x = min(rect1.origin.x, rect2.origin.x);
     unionResultRect.origin.y = min(rect1.origin.y, rect2.origin.y);
     unionResultRect.size.width = min(rect1.origin.y, rect2.origin.y);
     unionResultRect.size.height = min(rect1.origin.y, rect2.origin.y);
     */
    CGRect unionRect1 = CGRectMake(100, 50, 60, 70);
    CGRect unionRect2 = CGRectMake(180, 20, 30, 40);
    CGRect unionRect3 = CGRectMake(120, 80, 80, 90);
    CGRect unionResultRect1 = CGRectUnion(unionRect1, unionRect2);
    CGRect unionResultRect2 = CGRectUnion(unionRect1, unionRect3);
    NSLog(@"unionResultRect1 = %@, unionResultRect2 = %@",NSStringFromCGRect(unionResultRect1),NSStringFromCGRect(unionResultRect2));
    
    //CGRectIntersection 用法
    /*
     CGRectIntersection(rect1, rect2)
     求两个矩形的交集，返回结果是两个矩形相交的区域，如果没有交集的话，返回值是NSNullRect
     */
    CGRect interRect1 = CGRectMake(100, 50, 60, 70);
    CGRect interRect2 = CGRectMake(180, 20, 30, 40);
    CGRect interRect3 = CGRectMake(120, 80, 80, 90);
    CGRect intersectionRect1 = CGRectIntersection(interRect1, interRect2);
    CGRect intersectionRect2 = CGRectIntersection(interRect1, interRect3);
    NSLog(@"intersectionRect1 = %@, intersectionRect2 = %@",NSStringFromCGRect(intersectionRect1),NSStringFromCGRect(intersectionRect2));
    
#pragma mark ------------------------------------------获取x,y,width,height---------------------------------------------------
    //CGRectGetMinX(originalRect),CGRectGetMidX(originalRect),CGRectGetMaxX(originalRect),CGRectGetMinY(originalRect),CGRectGetMidY(originalRect),CGRectGetMaxY(originalRect) , CGRectGetWidth(originalRect), CGRectGetHeight(originalRect)用法
    /*
     minX = originalRect.origin.x;
     midX = (minX + maxX)/2;
     maxX = (originalRect.origin.x + originalRect.size.width);
     
     minY = originalRect.origin.y;
     midY = (minY + maxY)/2;
     maxY = (originalRect.origin.y + originalRect.size.height);
     
     width = originalRect.size.width;
     height = originalRect.size.height;
     */
    NSLog(@"minX = %f, midX = %f, maxX = %f, minY = %f, midY = %f, maxY = %f, width = %f, height = %f",CGRectGetMinX(originalRect),CGRectGetMidX(originalRect),CGRectGetMaxX(originalRect),CGRectGetMinY(originalRect),CGRectGetMidY(originalRect),CGRectGetMaxY(originalRect),CGRectGetWidth(originalRect), CGRectGetHeight(originalRect));
    
    //CGRectGetWidth(originalRect), CGRectGetHeight(originalRect),用法
    /*
     width = originalRect.size.width;
     height = originalRect.size.height;
     */
    NSLog(@"width = %f, height = %f",CGRectGetWidth(originalRect), CGRectGetHeight(originalRect));
#pragma mark -----------------------------------------NSString 与 CGRect 转换-----------------------------------------------
    //NSString 与 CGRect 转换
    NSString *originalRectStr = NSStringFromCGRect(originalRect);
    CGRect rectFromStr = CGRectFromString(originalRectStr);
    NSLog(@"originalRectStr = %@, rect = %@",originalRectStr,NSStringFromCGRect(rectFromStr));
    
#pragma mark -----------------------------------------CGRect 与 NSDictionary 转换---------------------------------------------
    //.CGRect与NSDictionary转换
    CFDictionaryRef frameDictRef = CGRectCreateDictionaryRepresentation(originalRect);
    NSDictionary *frameDict = [NSDictionary dictionaryWithDictionary:(NSDictionary*)CFBridgingRelease(frameDictRef)]; // autoreleased
    CGRect rectFromDic;
    CGRectMakeWithDictionaryRepresentation((CFDictionaryRef)frameDict, &rectFromDic);
    NSLog(@"frameDict = %@, rectFromDic = %@",frameDict, NSStringFromCGRect(rectFromDic));
    
#pragma mark -----------------------------------------CGRect 与 NSValue 转换---------------------------------------------
    //. CGRect与NSValue转换
    /*
     在NSArray,NSDictionary容器中只能存储Objetive-C对象，不能直接存储C结构体，所有需要存储矩形时，需要将其转换为NSValue值。
     */
    NSValue *originalRectValue = [NSValue valueWithCGRect:originalRect];
    CGRect valueRect = [originalRectValue CGRectValue];
    NSLog(@"originalRectValue = %@, valueRect = %@",originalRectValue, NSStringFromCGRect(valueRect));
    
#pragma mark -----------------------------------------判断---------------------------------------------
    //CGRectEqualToRect
    /*
     CGRectEqualToRect(CGRect rect1, CGRect rect2)
     rect1 与 rect2 的origin,size 完全相同 ，返回YES;否则，返回NO;
     */
    if (CGRectEqualToRect(unionRect1, unionRect2)) {
        NSLog(@"相同");
    } else {
        NSLog(@"不相同");
    }
    
    //CGRectIsEmpty(CGRect rect)
    /*
     rect的宽度和高度只要有一个就会被定为emptyRect
     */
    CGRect emptyRect = CGRectMake(0, 10, 0, 20);
    if (CGRectIsEmpty(emptyRect)) {
        NSLog(@"是 emptyRect");
    } else {
        NSLog(@"不是 emptyRect");
    }
    
    //CGRectIsNull(CGRect rect)
    /*
     rect 是NSNullRect 返回true
     */
    if (CGRectIsNull(originalRect)) {
        NSLog(@"是 NSNullRect ");
    } else {
         NSLog(@"不是 NSNullRect ");
    }
    
    //CGRectIsInfinite(CGRect rect)
    /*
     判断是不是无穷大矩形
     */
    if (CGRectIsInfinite(originalRect)) {
        NSLog(@"是 无穷大 ");
    } else {
        NSLog(@"不是 无穷大 ");
    }
    
    //CGRectContainsPoint(CGRect rect, CGPoint point)
    /*
     判断rect 是不是包含 point 这个点
     */
    CGPoint position = CGPointMake(100, 100);
    if (CGRectContainsPoint(originalRect, position)) {
        NSLog(@" rect 包含 point");
    } else {
        NSLog(@" rect 不包含 point");
    }
    
    //CGRectContainsRect(CGRect rect1, CGRect rect2)
    /*
     判断 rect2  是不是在 rect1 里面
     */
    if (CGRectContainsRect(unionRect1, unionRect2)) {
        NSLog(@" rect1 包含 rect2");
    } else {
        NSLog(@" rect1 不包含 rect2");
    }
    
    //CGRectIntersectsRect(CGRect rect1, CGRect rect2)
    /*
     判断 rect1 与 rect2 是不是有交集
     */
    if (CGRectIntersectsRect(unionRect1, unionRect2)) {
        NSLog(@" rect1 与 rect2 有交集");
    } else {
        NSLog(@" rect1 与 rect2 没有交集");
    }