本文以实例详细描述了Objective-C中常用的结构体NSRange,NSPoint,NSSize(CGSize),NSRect的定义及用法，具体如下所示：
1、NSRange：
NSRange的原型为
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typedef struct _NSRange {
NSUInteger location;
NSUInteger length;
} NSRange;
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NSMakeRange的函数：
NS_INLINEz是内联函数
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typedef NSRange *NSRangePointer;
NS_INLINE NSRange NSMakeRange(NSUInteger loc, NSUInteger len) {
NSRange r;
r.location = loc;
r.length = len;
return r;
}
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使用方法：
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//NSRange表示的是范围
NSRange range;
range.location = 18;
range.length = 34;
NSLog(@"location is %zi",range.location);
NSLog(@"length is %zi",range.length);
//快速创建
range = NSMakeRange(8, 10);
NSLog(@"location is %zi",range.location);
NSLog(@"length is %zi",range.length);
//NSStringFromRange将上面的结构体转化成字符串类型,打印出来
NSString* str1 = NSStringFromRange(range);
//%@是一个OC对象,range代表的是一个结构体,str是一个OC对象
NSLog(@"rang is %@",str1);
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2、NSPoint：
NSPoint的原型：
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struct CGPoint {
CGFloat x;
CGFloat y;
};
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NSMakePoint函数：
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NS_INLINE NSPoint NSMakePoint(CGFloat x, CGFloat y) {
NSPoint p;
p.x = x;
p.y = y;
return p;
}
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CGPointMake函数：
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CGPointMake(CGFloat x, CGFloat y)
{
CGPoint p; p.x = x; p.y = y; return p;
}
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使用方法：
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//NSPoint指的是位置
NSPoint point;
//给结构体里面的点进行赋值
point.x = 10;
point.y = 10;
//快速创建点
point = NSMakePoint(10, 18);
//常见的是CGPointMake创建点的函数
point = CGPointMake(29, 78);
NSString* str2 = NSStringFromPoint(point);
NSLog(@"point is %@",str2);
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3、CGSize：
CGSize的原型：
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struct CGSize {
CGFloat width;
CGFloat height;
};
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NSMakeSize函数：
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NS_INLINE NSSize NSMakeSize(CGFloat w, CGFloat h) {
NSSize s;
s.width = w;
s.height = h;
return s;
}
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CGSizeMake函数：
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CGSizeMake(CGFloat width, CGFloat height)
{
CGSize size; size.width = width; size.height = height; return size;
}
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使用方法：
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NSSize size;
size.width = 100;
size.height = 12;
size = NSMakeSize(12, 12);
size = CGSizeMake(11, 11);
NSString* str3 = NSStringFromSize(size);
NSLog(@"%@",str3);
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4、CGRect：
CGRect的原型：
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struct CGRect {
CGPoint origin;
CGSize size;
};
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CGRectMake的函数：
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CGRectMake(CGFloat x, CGFloat y, CGFloat width, CGFloat height)
{
CGRect rect;
rect.origin.x = x; rect.origin.y = y;
rect.size.width = width; rect.size.height = height;
return rect;
}
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NSMakeRect函数：
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NS_INLINE NSRect NSMakeRect(CGFloat x, CGFloat y, CGFloat w, CGFloat h) {
NSRect r;
r.origin.x = x;
r.origin.y = y;
r.size.width = w;
r.size.height = h;
return r;
}
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使用方法
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//既包含了尺寸大小和位置
NSRect rect;
rect.origin.x = 12;
rect.origin.y = 14;
rect.size.width = 12;
rect.size.height = 15;
//快速创建方法
rect = CGRectMake(12, 12, 12, 12);
rect = NSMakeRect(11, 11, 11, 11);
//转化成字符串打印出来
NSString* str5 = NSStringFromRect(rect);
NSLog(@"rect is <a href="mailto:%@",str5" rel="external nofollow">%@",str5</a>);
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