objective-c-2.0 | 易学教程

Passing Click Through Transparent Window

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问题 I have a fullscreen transparent window. When the user clicks on it I want the click to be sent to what's underneath the window. How would I do so? 回答1: Setting IgnoresMouseEvents to YES should do the trick.. (void)setIgnoresMouseEvents:(BOOL)ignoreMouseEvents Specifies whether the window is transparent to mouse clicks and other mouse events, allowing overlay windows. http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/ApplicationKit/Classes/NSWindow_Class/Reference/Reference

technique to create falling letters and words

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I'm looking for a technique to create a window with letters that drop from top to bottom, forming words as they go. This is similar to the scroll screens used in the Apple Retail Stores. What language(s) should I use? Are their techniques I can pluck? Many thanks. I'm not super-familiar with the system you are trying to immitate, but I found something that sounds like it might be useful to you after some tweaking. Falling Text There is a wonderful resource that has been developed over the past ten years by a french programmer: Gerard Ferrandez. The site is http://www.dhteumeuleu.com/ .

technique to create falling letters and words

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问题 I'm looking for a technique to create a window with letters that drop from top to bottom, forming words as they go. This is similar to the scroll screens used in the Apple Retail Stores. What language(s) should I use? Are their techniques I can pluck? Many thanks. 回答1: I'm not super-familiar with the system you are trying to immitate, but I found something that sounds like it might be useful to you after some tweaking. Falling Text 回答2: There is a wonderful resource that has been developed

strong and weak keyword placement - Objective-C

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The compiler seems to have no problem with the two following declarations: NSObject * __weak weakThing; __weak NSObject *anotherWeakThing; Is there a difference between the two? Is the behavior like the const keyword ? I ask because Xcode's warning generally suggest ... SomeDataType * __weak / __strong ... when you've goofed something up. So I've tried to follow this pattern, but wondered if there was a difference at all. No, there is no difference. With the const keyword, there are multiple things it could apply to in a declaration; it could apply to the pointer, or it could apply to the

(null) libc++abi.dylib: terminate called throwing an exception

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问题 I use Xcode 4.5PR and iOS 6beta 2. I didn't change any codes, my application throw an exception mentioned in the Title. I used Debug Window which function caused this exception, but it showing 0x38dda960: push {r4, r5, r6, r7, lr} How can I find a problem? How can I fix it? 回答1: If you didn't change anything, this could just simply be related to the iOS 6 beta as it currently stands. However, for those googling upon this error, here are some general suggestions: 1) It could be the simulator

Does Objective-C support Mixin like Ruby?

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In Ruby, there's Modules and you can extend a class by "mixing-in" the module. module MyModule def printone print "one" end end class MyClass include MyModule end theOne = MyClass.new theOne.printone >> one In Objective-C, I find that I have a set of common methods that I want a number of Class to "inherit". What other ways can I achieve this without creating a common class and deriving all from that common class? Jean-Denis Muys Edit : changes added because some people feel I am responsible for the limitations of Objective-C. Short answer : you can't. Objective-C doesn't have the equivalent

(null) libc++abi.dylib: terminate called throwing an exception

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I use Xcode 4.5PR and iOS 6beta 2. I didn't change any codes, my application throw an exception mentioned in the Title. I used Debug Window which function caused this exception, but it showing 0x38dda960: push {r4, r5, r6, r7, lr} How can I find a problem? How can I fix it? If you didn't change anything, this could just simply be related to the iOS 6 beta as it currently stands. However, for those googling upon this error, here are some general suggestions: 1) It could be the simulator you've chosen to build the same code for : If you haven't changed any source code, check to make sure your

What is the point of @property and @synthesize?

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问题 I haven't been able to figure it out, and there are no websites which explain it clearly enough... what exactly are the purposes of @property and @synthesize ? Thanks in advance! 回答1: Objective-C Runtime Programming Guide: Declared Properties @property declares the getter and the setter methods for the public property you want to implement. For example this property declaration: @property float value; is equivalent to: - (float)value; - (void)setValue:(float)newValue; @synthesize provides