bounds坐标：自己定义的坐标系统，setbound指明了本视图左上角在该坐标系统中的坐标，
默认值（0，0）
frame坐标： 子视图左上角在父视图坐标系统（bounds坐标系统）中的坐标，默认值（0，0）
子视图实际位置＝父视图实际位置－父视图bounds坐标＋子视图frame坐标
一、bounds
只影响“子视图”相对屏幕的位置，修改时不会影响自身相对屏幕的位置
1、父视图bounds坐标为（0，0）时
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(20,20,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
}
2、父视图bounds坐标为（－20，－20）时
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(20,20,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
[self.view setBounds:CGRectMake(-20, -20,320,568)];
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
｝
二、frame
修改时改变了自己的在父视图坐标系统（bounds坐标系统）的位置，自身位置和
子视图位置都会被改变。
1、父视图frame坐标（0，0）
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(0,0,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
UIView*view2 = [[UIView alloc] initWithFrame:CGRectMake(0,0,100,100)];
view2.backgroundColor=[UIColor yellowColor];
[view1 addSubview:view2];
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view1.frame),NSStringFromCGRect(view1.bounds));
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view2.frame),NSStringFromCGRect(view2.bounds));
｝
2、父视图frame坐标（60，60）
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(60,60,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
UIView*view2 = [[UIView alloc] initWithFrame:CGRectMake(0,0,100,100)];
view2.backgroundColor=[UIColor yellowColor];
[view1 addSubview:view2];
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view1.frame),NSStringFromCGRect(view1.bounds));
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(view2.frame),NSStringFromCGRect(view2.bounds));
｝
三、说明
根视图只能修改bounds坐标，而不可以修改frame坐标
以下self.view为根视图
1、初始状态
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(20,20,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
｝
2、修改bounds坐标：有效
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(20,20,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
CGRect viewBounds=self.view.bounds;
viewBounds.origin.y=-40;
viewBounds.origin.x=-40;
self.view.bounds=viewBounds;
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
｝
3、修改frame坐标：无效
- (void)viewDidLoad {
[super viewDidLoad];//Do any additional setup after loading the view, typically from a nib.UIView*view1 = [[UIView alloc] initWithFrame:CGRectMake(20,20,200,260)];
view1.backgroundColor=[UIColor redColor];
[self.view addSubview:view1];
CGRect viewFrame=self.view.frame;
viewFrame.origin.y=60;
viewFrame.origin.x=60;
self.view.frame=viewFrame;
NSLog(@"view frame:%@========view bounds:%@",NSStringFromCGRect(self.view.frame),NSStringFromCGRect(self.view.bounds));
｝