无法在LLDB中传递CGColorRef类型的参数 [英] Can't pass parameter of type CGColorRef in LLDB
问题描述
我正在扩展Facebook的凿子,以便能够从调试器中看到颜色.我希望它适用于UIColor
,CIColor
和CGColorRef
.两种基于对象的工具都可以正常工作,但是CGColorRef
给我带来麻烦.
I'm extending Facebook’s Chisel to be able to visualize a color from the debugger. I want it to work for UIColor
, CIColor
, and CGColorRef
. The two object-based ones are working fine, but the CGColorRef
is giving me trouble.
这里是我正在使用的错误,我已经在其中进行了哈希处理从这个问题中找出一堆东西.
Here is the bug I'm working from, where I've already hashed out a bunch of the stuff from this question.
我将问题归结为该测试用例:
I've boiled the issue down to this test case:
如果我有一些功能:
+ (UIColor *)someColor {
UIColor *uiColor = [UIColor redColor];
CGColorRef cgColor = uiColor.CGColor;
UIColor *newUIColor = [UIColor colorWithCGColor:cgColor];
return newUIColor;
}
然后在return newUIColor;
行上设置一个断点,这就是LLDB中发生的情况:
And I set a breakpoint on the return newUIColor;
line, this is what happens in LLDB:
(lldb) po cgColor
<CGColor 0x7f992b626710> [<CGColorSpace 0x7f992b70d5b0> (kCGColorSpaceDeviceRGB)] ( 0 0.478431 1 1 )
(lldb) po [UIColor colorWithCGColor:cgColor]
error: cannot initialize a parameter of type 'CGColor *' with an lvalue of type 'CGColorRef' (aka 'CGColor *')
error: 1 errors parsing expression
(lldb) po [UIColor colorWithCGColor:(CGColorRef)cgColor]
error: cannot initialize a parameter of type 'CGColor *' with an rvalue of type 'CGColorRef' (aka 'CGColor *')
error: 1 errors parsing expression
(lldb) po [UIColor colorWithCGColor:(id)cgColor]
error: cannot initialize a parameter of type 'CGColor *' with an rvalue of type 'id'
error: 1 errors parsing expression
(lldb) po [UIColor colorWithCGColor:(CGColor *)cgColor]
error: use of undeclared identifier 'CGColor'
error: expected expression
error: 2 errors parsing expression
(lldb) expr @import CoreGraphics
(lldb) po [UIColor colorWithCGColor:(CGColorRef)cgColor]
error: cannot initialize a parameter of type 'CGColor *' with an rvalue of type 'CGColorRef' (aka 'CGColor *')
error: 1 errors parsing expression
(lldb) po [UIColor colorWithCGColor:(CGColor *)cgColor]
error: cannot initialize a parameter of type 'CGColor *' with an rvalue of type 'CGColor *'
error: 1 errors parsing expression
(lldb) po [UIColor colorWithCGColor:(struct CGColor *)cgColor]
error: cannot initialize a parameter of type 'CGColor *' with an rvalue of type 'struct CGColor *'
error: 1 errors parsing expression
那么,如何获取lldb
来执行带有CGColorRef
类型参数的行?
So, how can I get lldb
to execute a line that takes a parameter of type CGColorRef
?
推荐答案
我能够使用以下方法使其正常工作:
I was able to get this to work using:
(lldb) po [[UIColor alloc] initWithCGColor:cgColor]
UIDeviceRGBColorSpace 1 0 0 1
来自UIColor.h
:
@property(nonatomic,readonly) CGColorRef CGColor;
- (CGColorRef)CGColor NS_RETURNS_INNER_POINTER CF_RETURNS_NOT_RETAINED;
因此,我相信UIColor
超出范围,并且.CGColor
的内存不再有效.我可能必须复制它,但出于我的目的,使用-initWithCGColor:
可以正常工作.
So I believe the UIColor
is going out of scope and the memory of the .CGColor
is no longer valid. I would probably have to copy it, but for my purposes, using the -initWithCGColor:
works fine.
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