前言

• 結構體 這個結構體用來表示事物的坐標點和寬高度。

typedef CGRect NSRect;

struct CGRect {
    CGPoint origin;
    CGSize size;
};

typedef struct CGRect CGRect;

1、NSRect 結構體變量的創建與調用

// NSRect 結構體變量的創建與賦值

// 先定義變量，再賦值
NSRect rect1;
rect1.origin.x = 6;
rect1.origin.y = 1;
rect1.size.width = 1;
rect1.size.height = 6;

// 定義時直接賦值，或者  NSRect rect2 = {{7, 2}, {2, 7}};
NSRect rect2 = {7, 2, 2, 7};

// 給指定成員賦值
NSRect rect3 = {.size.height = 8, .size.width = 3, .origin.y = 3, .origin.x = 8};

// 使用函數賦值
NSRect rect4 = NSMakeRect(9, 4, 4, 9);

// 使用等價的結構體定義，等價於 CGRect rect5 = CGRectMake(10, 5, 5, 10);
NSRect rect5 = CGRectMake(10, 5, 5, 10);

// NSRect 結構體變量值的調用

NSLog(@"rect1: %.0f, %.0f, %.0f, %.0f", rect1.origin.x, rect1.origin.y, rect1.size.width, rect1.size.height);
NSLog(@"rect2: %.0f, %.0f, %.0f, %.0f", rect2.origin.x, rect2.origin.y, rect2.size.width, rect2.size.height);
NSLog(@"rect3: %.0f, %.0f, %.0f, %.0f", rect3.origin.x, rect3.origin.y, rect3.size.width, rect3.size.height);
NSLog(@"rect4: %.0f, %.0f, %.0f, %.0f", rect4.origin.x, rect4.origin.y, rect4.size.width, rect4.size.height);
NSLog(@"rect5: %.0f, %.0f, %.0f, %.0f", rect5.origin.x, rect5.origin.y, rect5.size.width, rect5.size.height);
 

2、NSRect 與 NSString 的相互轉換

// NSRect 轉 NSString
NSString *stringFronRect = NSStringFromRect(rect5);

// NSString 轉 NSRect
NSRect rect6 = NSRectFromString(stringFronRect);

NSRect 位置和尺寸