常见结构体...

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
	@autoreleasepool {
		CGPoint p1;
		p1.x = 10;
		p1.y = 20;

		CGPoint p2 = { 10, 20 };

		CGPoint p3 = {.x = 10, .y = 20 };
		CGPoint p4 = (CGPoint){ 10, 20 };
		CGPoint p5 = CGPointMake(10, 20);
		NSLog(@"%@", NSStringFromPoint(p5));

		NSPoint np1;
		np1.x = 10;
		np1.y = 20;
		NSPoint np2 = NSMakePoint(10, 20);
		NSLog(@"%@", NSStringFromPoint(np2));

		CGRect r1 = CGRectMake(0, 0, 100, 200);

		CGRect r2 = { { 0, 0 }, { 100, 200 } };

        NSRect nr = NSMakeRect(0, 0, 100, 200);

        // 苹果官方推荐使用 CG开头的结构体, 通用 NS开头的方法...
	}
	return 0;
}