很久沒練習 iPhone 程式，大概有半年吧？剛好無意間看到片斷的程式，就順便記錄一下。
這兩張圖共三個重點：
- 中間顯示的框框是有圓角的
- 框框無論 iPhone 擺在哪，都可以置中
- 無論直看或橫向，框框都會自動地調整填滿
程式碼：
@untitled.h (新增一個 UIViewController)
#import <UIKit/UIKit.h>
#import <QuartzCore/QuartzCore.h>
@interface untitled : UIViewController {
UIView *_blockerView;
}
@end
@untitled.m
- (void)viewDidLoad {
[super viewDidLoad];
CGSize _blockerViewSize = CGSizeMake(250, 450);
if( UIInterfaceOrientationIsLandscape( [[UIDevice currentDevice] orientation] ) )
_blockerViewSize = CGSizeMake(450, 250);
_blockerView = [[[UIView alloc] initWithFrame:CGRectMake(0, 0, _blockerViewSize.width, _blockerViewSize.height)] autorelease];
_blockerView.backgroundColor = [UIColor colorWithWhite:0.0 alpha:0.8];
_blockerView.center = CGPointMake(self.view.bounds.size.width/2, self.view.bounds.size.height/2);
_blockerView.clipsToBounds = YES;
if( [_blockerView.layer respondsToSelector:@selector(setCornerRadius:)] )
[_blockerView.layer setCornerRadius:10];
_blockerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:_blockerView];
}
- (void) didRotateFromInterfaceOrientation: (UIInterfaceOrientation) fromInterfaceOrientation {
_blockerView.center = CGPointMake(self.view.bounds.size.width / 2, self.view.bounds.size.height / 2);
}
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return YES;
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
各項部分：
- 圓角
- #import <QuartzCore/QuartzCore.h>
if( [_blockerView.layer respondsToSelector:@selector(setCornerRadius:)] )
[_blockerView.layer setCornerRadius:10];
- #import <QuartzCore/QuartzCore.h>
- 置中
- _blockerView.center = CGPointMake(self.view.bounds.size.width/2, self.view.bounds.size.height/2);
- 並且實作兩個對應函數
- - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
- - (void)didRotateFromInterfaceOrientation: (UIInterfaceOrientation) fromInterfaceOrientation
- 自動調整大小
- _blockerView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
此部分常用在呈現 loading 或 waiting 的訊息，此時顯示黑色框框，大部分大小會調整成小型的正方型，不需要自動調整大小的功能，僅需置中即可，但如果需要疊一層圖層避免使用者點選到後面的部分，那就會需要自動調整大小的功能，以符合當下顯示或阻擋的大小。用法就跟在 Web Programming 上，使用 div 圖層顯示資訊或擋住不讓使用者點選到其他功能。
