OC -- 结构体

//  NSPoint\CGPoint(常用)  NSSize\CGSize(常用)  NSRect\CGRect(常用)  NSRange

NSPoint p1 = NSMakePoint(10, 10); 

CGPoint p2 = CGPointMake(10, 20);    // 常用

NSSize s1 = NSMakeSize(50, 50);

CGSize s2 = CGSizeMake(50, 100);  // 常用

CGPointZero == CGPointMake(0, 0);   // CGPointZero表示原点(相应的有: CGSizeZero  CGRectZero)

// CGRect的创建方式

CGRect r1 = CGRectMake(10, 10, 50, 50);

CGRect r2 = {{0, 0}, {100, 100}};

CGRectMake r3 = {p1, s1};

// 使用CGPointZero的前提是添加CoreGraphics框架

CGRect r4 = {CGPointZero, CGSizeMake(80, 90)};

// 将结构体转为字符串

NSString *str1 = NSStringFromPoint(p1);

NSString *str2 = NSStringFromSize(s1);

NSString *str3 = NSStringFromRect(r1);

//NSRange

NSRange r1 = NSMakeRange(3, 5);

NSString *str4 = @"As god name";

// 查找某个字符串在str中的范围

// 如果找不到,length = 0, location == NSNotFound == -1

NSRange range = [str rangeOfString:@"god"];

NSLog(@"location = %ld, length = %ld", range.location, range.length);