ios視圖frame和bounds的對比

bounds座標：自己定義的座標系統，setbound指明了本視圖左上方在該座標系統中的座標，

　　　　　　  預設值（0，0）

frame座標：  子視圖左上方在父視圖座標系統（bounds座標系統）中的座標，預設值（0，0）

子視圖實際位置＝父視圖實際位置－父視圖bounds座標＋子視圖frame座標

一、bounds

　　隻影響“子視圖”相對螢幕的位置，修改時不會影響自身相對螢幕的位置

　　1、父視圖bounds座標為（0，0）時

- (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、父視圖bounds座標為（－20，－20）時　

- (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

　　修改時改變了自己的在父視圖座標系統（bounds座標系統）的位置，自身位置和

　　子視圖位置都會被改變。

　　1、父視圖frame座標（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、父視圖frame座標（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、說明

　　根視圖只能修改bounds座標，而不可以修改frame座標

　　以下self.view為根視圖

　　1、初始狀態

- (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座標：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座標：無效

- (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));｝