設定UI元件的背景圖片

用圖片設定backgroundColor
圖片將重覆排列
ex:

    self.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"mainBackground.png"]];

UIBarButtonItem


背景圖片高度

30px (60px retina display) = portrait

24px (48px retina display) = landscape



UIImage *backButtonImage = [UIImage imageNamed:@"test.png"];

固定左右的寬度

backButtonImage = [backButtonImage resizableImageWithCapInsets:UIEdgeInsetsMake(0, 6, 0, 6)];
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:backButtonImage
                                                      forState:UIControlStateNormal
                                                    barMetrics:UIBarMetricsDefault];
 

 [[UIBarButtonItem appearance] setBackgroundImage:barButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];

比較字少跟字多的樣子

圖片高度的影響

redButton.png: 70*70,  140*140


UIImage *barButtonImage = [UIImage imageNamed:@"redButton.png"];
[[UIBarButtonItem appearance] setBackgroundImage:barButtonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
 
UIBarButtonItem *saveButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Save" style:UIBarButtonItemStylePlain target:self action:@selector(save:)];
self.navigationItem.rightBarButtonItem = saveButtonItem;

y軸置中於navigation bar。button高度等於原來圖片高度

圖片高度小於30 points會被放大成30 points
圖片高度大於30 points會維持原高度

UINavigationBar



UINavigationController *navController = [[UINavigationController alloc]
    initWithRootViewController:controller];
// 圖片size: 320*44, 640*88
UIImage *menuBarImage = [UIImage imageNamed:@"bar.png"];
[navController.navigationBar setBackgroundImage:menuBarImage
      forBarMetrics:UIBarMetricsDefault];

如果將bar設為translucent，要記得同時將clipsToBounds設為YES
navController.navigationBar.translucent = YES;
 navController.navigationBar.clipsToBounds = YES;


clipsToBounds沒有設定YES時，多出一條線

clipsToBounds設定YES時

UIButton

如果沒有設定contentMode，預設的圖片比例是?

設定UIViewContentModeScaleAspectFill的圖片


   photoBut.imageView.contentMode = UIViewContentModeScaleAspectFill;

  [photoBut setImage:choosenImage forState:UIControlStateNormal];

 if([[[UIDevice currentDevice] systemVersion] intValue] < 6)

        {

            photoBut.adjustsImageWhenHighlighted = NO;

            

        }

如果圖片size小於button的大小，利用setImage設定的圖片將維持圖片原來的size置中。UIImageView沒有這個問題。

UITextField


bmrTextField.background = image;