ios视图frame和bounds的对比

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));
｝