Month: March 2014
[iOS] 用 UIImagePickerController 從 相片庫挑選一張照片來顯示片段碼 , UIImagePickerControllerSourceTypeSavedPhotosAlbum , didFinishPickingMediaWithInfo ,
.h檔: 要加
@interface ViewController : UIViewController
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.m 檔:
. . . UIImagePickerController *picker = [[UIImagePickerController alloc] init]; picker.delegate = self; picker.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum; picker.allowsEditing = YES; [self presentViewController:picker animated:YES completion:nil]; resultBox.text = @"Hello World!"; } - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { [self dismissViewControllerAnimated:YES completion:nil]; NSLog(@"\nin didFinishPickingMediaWithInfo\n"); imgBox.image = [info objectForKey:UIImagePickerControllerOriginalImage]; }
[iOS] xcode iPhone Simulator 照片存放的位置
~/Library/Application Support/iPhone Simulator
[參考] Objective-C Cheat Sheet and Quick Reference
Objective-C Cheat Sheet and Quick Reference
URL : http://www.raywenderlich.com/4872/objective-c-cheat-sheet-and-quick-reference
[iOS] Objective-C , block 寫法
在新的iOS API中block被大量用來取代傳統的delegate和callback,而新的API會大量使用block主要是基於以下兩個原因:
可以直接在程式碼中撰寫等會要接著執行的程式,直接將程式碼變成函數的參數傳入函數中,這是新API最常使用block的地方。 可以存取區域變數,在傳統的callback實作時,若想要存取區域變數得將變數封裝成結構才能使用,而block則是可以很方便地直接存取區域變數。
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Objective C Blocks: Summary, Syntax & Best Practices
http://amattn.com/p/objective_c_blocks_summary_syntax_best_practices.html