Swift-automatically calculates the width and height of a string

Write a method to inherit a string

Automatic text wrapping and width control

Extension String {

func textsizewithfont (font: uifont, constrainedtosize size:cgsize), cgsize {

var textSize:cgsize!

if cgsizeequaltosize(size, Cgsizezero) {

let attributes = nsdictionary(Object:font, Forkey: nsfontattributename)

TextSize = self. Sizewithattributes(Attributes as!) [string : anyobject] as [string : anyobject])

} Else {

let option = nsstringdrawingoptions. Useslinefragmentorigin

            let attributes = nsdictionary (Object:font, Forkey: Nsfontattributename)

let stringrect = self. Boundingrectwithsize(Size, options:option, attributes:attributes as!) [string : anyobject] as [string : anyobject], context: nil)

TextSize = Stringrect. size

}

return textSize

}

}

Usage:

Let projecttext="I am a string, to calculate my height ";

let projectsize=sizewithtext(Projecttext, maxSize: cgsizemake( ), font: uifont. Systemfontofsize(+));

let comprojectw:cgfloat=projectsize. width;

let comprojecth:cgfloat=projectsize. Height;

Remember to add a uilable in the computed string

　　Uilable.font=uifont.systemfontofsize (14);

　　Show several lines

Uilable. NumberOfLines=1;

　　

Uilable. frame = CGRectMake(comprojectw, comprojecth);

Swift-automatically calculates the width and height of a string