修正以下代码中的问题, The argument type 'Color?' can't be assigned to the parameter type 'Color'.
color: Colors.grey[300],
Raccoon's answer
The code you provided does not have any argument of type Color?, so it's unclear where the error is coming from. However, I can provide a solution for a possible issue.
If you have a variable with type Color?, you can use the ?. null-aware operator to check if the variable is not null before assigning it to a variable of type Color. Here's an example:
Color? nullableColor;
Color nonNullableColor;
if (nullableColor != null) {
nonNullableColor = nullableColor;
} else {
nonNullableColor = Colors.grey[300];
}
In this example, if nullableColor is not null, it is assigned to nonNullableColor, which has the expected type of Color. If nullableColor is null, nonNullableColor is assigned the default value of Colors.grey[300].
Your expection
没有使用中文回答
Extension version: 0.67.0
VS Code version: Code 1.87.2 (863d2581ecda6849923a2118d93a088b0745d9d6, 2024-03-08T15:20:17.278Z)
OS version: Windows_NT x64 10.0.22631
Modes:
Type: Bug
Your question
修正以下代码中的问题, The argument type 'Color?' can't be assigned to the parameter type 'Color'.
Raccoon's answer
The code you provided does not have any argument of type
Color?, so it's unclear where the error is coming from. However, I can provide a solution for a possible issue.If you have a variable with type
Color?, you can use the?.null-aware operator to check if the variable is not null before assigning it to a variable of typeColor. Here's an example:In this example, if
nullableColoris not null, it is assigned tononNullableColor, which has the expected type ofColor. IfnullableColoris null,nonNullableColoris assigned the default value ofColors.grey[300].Your expection
没有使用中文回答
Extension version: 0.67.0 VS Code version: Code 1.87.2 (863d2581ecda6849923a2118d93a088b0745d9d6, 2024-03-08T15:20:17.278Z) OS version: Windows_NT x64 10.0.22631 Modes:
System Info
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direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled| |Load (avg)|undefined| |Memory (System)|63.75GB (16.92GB free)| |Process Argv|--crash-reporter-id ab7a00de-b70a-44a4-9f2f-fa0cc21bdc63 --crash-reporter-id ab7a00de-b70a-44a4-9f2f-fa0cc21bdc63| |Screen Reader|no| |VM|0%|
A/B Experiments
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