IOS sets some properties with KeyPath

1.UIButton title from the left display

Button.contenthorizontalalignment = Uicontrolcontenthorizontalalignmentleft;

　　

　　

2.UITextField placeholder Color

Method One:

Textfield.placeholder = @ "This is placeholder";  [Textfieldsetvalue:[uicolor redcolor]forkeypath:@ "_placeholderlabel.textcolor"];  

　　

Method Two: (After IOS 6)

nsmutableattributedstring *placeholder = [[Nsmutableattributedstring alloc]initwithstring:@ "This is placeholder"]; [Placeholderaddattribute:nsforegroundcolorattributename                  value:[uicolor Redcolor]                  range:NSMakeRange (0, Placeholder.length)]; [Placeholderaddattribute:nsfontattributename                  value:[uifontboldsystemfontofsize:14]                  range:NSMakeRange (0 , placeholder.length)];textfield.attributedplaceholder = placeholder;

3. Hide the split line at the top of the TabBar

[Self.tabbar setvalue:@ (YES) forkeypath:@ "_hidesshadow"];

　　

　　

IOS sets some properties with KeyPath