[英]Type 'NSArray?.Type' does not conform to protocol 'Sequence'
从Objective-C转换后,我在Swift中遇到问题。 谁能帮我解决此问题?
var panels = NSArray?
func buttonTotalWidth() -> CGFloat {
var width: CGFloat = 0
for panel: UIView? in panels {
width += panel?.frame.width
}
return width
}
我的Objective C代码
@property NSArray *panels;
- (CGFloat)buttonTotalWidth {
CGFloat width = 0;
for (UIView *panel in self.panels) {
width += CGRectGetWidth(panel.frame);
}
return width;
}
请不要尝试将ObjC代码从字面上转换为Swift。 了解Swift的特定内容。
快速翻译可能是
var panels = [UIView]()
func buttonTotalWidth() -> CGFloat {
return panels.map{$0.frame.width}.reduce(0.0, + )
}
此方法接受UIView的数组(而不是可选的UIVIew),请尝试此
var panels = self.view.subviews
var width = buttonTotalWidth(panels)
func buttonTotalWidth(_ panels: [UIView]) -> CGFloat {
var width: CGFloat = 0
for panel: UIView in panels.enumerated() {
width += panel.frame.width
}
return width
}
如果这些是一些可选的UIView,请尝试此操作,
func buttonTotalWidth(_ panels: [UIView?]) -> CGFloat {
var width: CGFloat = 0
for panel: UIView? in panels.enumerated() {
width += panel?.frame.width
}
return width
}
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