Xcode 6 我用代码改变storyboard的控件的frame值为何无法成功，菜鸟新手求大神指点

Question

#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIButton *btn;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    NSLog(@"%f %f %f %f",_btn.frame.origin.x,_btn.frame.origin.y,_btn.frame.size.height,_btn.frame.size.width);
    _btn.frame = CGRectMake(20, 20, 280, 280);
    NSLog(@"%f %f %f %f",_btn.frame.origin.x,_btn.frame.origin.y,_btn.frame.size.height,_btn.frame.size.width);
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

在运行后 输出结果为：

2014-09-21 15:25:34.779 test[2473:80334] 20.000000 20.000000 30.000000 30.000000
2014-09-21 15:25:34.784 test[2473:80334] 20.000000 20.000000 30.000000 30.000000

Answer 1

Xcode6默认是勾选这两项的,去掉才能有效.不过,以后屏幕多了,用自动布局来适配屏幕是大势所趋,再用代码来适配将会是场噩梦,建议还是习惯用autolayout+sizeclasses适配屏幕