frame其实也是一个结构体，是CGRect的一个变量。
// // ViewController.m // UIView01 // // Created by cqy on 16/2/12. // Copyright © 2016年 程清杨. All rights reserved. // #import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建View对象 UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(20, 20, 200, 100)]; //设置背景颜色 view1.backgroundColor = [UIColor yellowColor]; //添加视图 [self.view addSubview:view1]; //frame其实也是一个结构体，有两个成员变量均为结构体，两个成员变量分别有两个成员变量都是cgfloat类型的； UIView *view2 = [[UIView alloc]init]; view2.frame = CGRectMake(20, 140, 200, 100); view2.backgroundColor = [UIColor greenColor];
[self.view addSubview:view2];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. }
@end
bounds：在每添加⼀个 view的时候，每个view分别以⾃⼰的起点为（0，0）点，创建⼀个坐标系，这个bounds就是⼀个结构体，⽤来确定view的新坐标。
// ViewController.m // UIView01 // // Created by cqy on 16/2/12. // Copyright © 2016年 程清杨. All rights reserved. // #import "ViewController.h" @interface ViewController () @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; //创建View对象 UIView *view1 = [[UIView alloc]initWithFrame:CGRectMake(20, 20, 200, 100)]; //设置背景颜色 view1.backgroundColor = [UIColor yellowColor]; //添加视图 [self.view addSubview:view1]; //frame其实也是一个结构体，有两个成员变量均为结构体，两个成员变量分别有两个成员变量都是cgfloat类型的； UIView *view2 = [[UIView alloc]init]; view2.frame = CGRectMake(20, 140, 200, 100); view2.backgroundColor = [UIColor greenColor]; [self.view addSubview:view2]; //bounds也是结构体，与frame一样。只是坐标是从原点开始； UIView *view3 = [[UIView alloc]init]; view3.bounds = CGRectMake(0, 0, 50, 50); view3.backgroundColor = [UIColor redColor]; [view2 addSubview:view3]; NSLog(@"view1.bounds:%@",NSStringFromCGRect(view1.bounds));//结果：view1.bounds:{ {0, 0}, {200, 100}} NSLog(@"view1.frame:%@",NSStringFromCGRect(view1.frame));//结果： view1.frame:{ {20, 20}, {200, 100}} //center是以视图坐标系为参照，取得中点 UIView *view4 = [[UIView alloc]initWithFrame:CGRectMake(20, 260, 200, 100)]; view4.backgroundColor = [UIColor brownColor]; [self.view addSubview:view4]; NSLog(@"view1.center:%@",NSStringFromCGPoint(view1.center));//结果：view1.center:{120, 70} // Do any additional setup after loading the view, typically from a nib. } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. }
@end
frame与bounds的区别：frame与bounds都是结构体，都是⽤来确定位置和⼤⼩的；
frame的位置是从屏幕的最左上⾓开始算的；
bounds是从新添加的view的最左上⾓的点开始算。