改变UITextField placeHolder颜色、字体
我們有時(shí)需要定制化UITextField對(duì)象的風(fēng)格,可以添加許多不同的重寫方法,來(lái)改變文本字段的顯示行為。這些方法都會(huì)返回一個(gè)CGRect結(jié)構(gòu),制定了文本字段每個(gè)部件的邊界范圍,甚至修改placeHolder顏色,字體。
– textRectForBounds: ????//重寫來(lái)重置文字區(qū)域
– drawTextInRect: ???????//改變繪文字屬性.重寫時(shí)調(diào)用super可以按默認(rèn)圖形屬性繪制,若自己完全重寫繪制函數(shù),就不用調(diào)用super了.
– placeholderRectForBounds: //重寫來(lái)重置占位符區(qū)域
– drawPlaceholderInRect: //重寫改變繪制占位符屬性.重寫時(shí)調(diào)用super可以按默認(rèn)圖形屬性繪制,若自己完全重寫繪制函數(shù),就不用調(diào)用super了
– borderRectForBounds: //重寫來(lái)重置邊緣區(qū)域
– editingRectForBounds: //重寫來(lái)重置編輯區(qū)域
– clearButtonRectForBounds: //重寫來(lái)重置clearButton位置,改變size可能導(dǎo)致button的圖片失真
– leftViewRectForBounds:
– rightViewRectForBounds:
通過(guò)– drawPlaceholderInRect:方法可改變placeHolder顏色、字體,請(qǐng)看代碼:
首先定義一個(gè)類CustomTextField讓它繼承UITextField實(shí)現(xiàn)以下方法即可:
//控制清除按鈕的位置
-(CGRect)clearButtonRectForBounds:(CGRect)bounds
{
???return?CGRectMake(bounds.origin.x?+ bounds.size.width?-?50, bounds.origin.y?+ bounds.size.height?-20,?16,?16);
}
//控制placeHolder的位置,左右縮20
-(CGRect)placeholderRectForBounds:(CGRect)bounds
{
????
????//return CGRectInset(bounds, 20, 0);
???CGRect?inset =?CGRectMake(bounds.origin.x+100, bounds.origin.y, bounds.size.width?-10, bounds.size.height);//更好理解些
???return?inset;
}
//控制顯示文本的位置
-(CGRect)textRectForBounds:(CGRect)bounds
{
????//return CGRectInset(bounds, 50, 0);
????CGRect?inset =?CGRectMake(bounds.origin.x+190, bounds.origin.y, bounds.size.width?-10, bounds.size.height);//更好理解些
????
????return?inset;
}
//控制編輯文本的位置
-(CGRect)editingRectForBounds:(CGRect)bounds
{
????//return CGRectInset( bounds, 10 , 0 );
????
???CGRect?inset =?CGRectMake(bounds.origin.x?+10, bounds.origin.y, bounds.size.width?-10, bounds.size.height);
???return?inset;
}
//控制左視圖位置
- (CGRect)leftViewRectForBounds:(CGRect)bounds
{
???CGRect?inset =?CGRectMake(bounds.origin.x?+10, bounds.origin.y, bounds.size.width-250, bounds.size.height);
???return?inset;
????//return CGRectInset(bounds,50,0);
}
//控制placeHolder的顏色、字體
- (void)drawPlaceholderInRect:(CGRect)rect
{
????//CGContextRef context = UIGraphicsGetCurrentContext();
????//CGContextSetFillColorWithColor(context, [UIColor yellowColor].CGColor);
????[[UIColororangeColor]?setFill];
????
????[[selfplaceholder]?drawInRect:rectwithFont:[UIFontsystemFontOfSize:20]];
}
?
//下面是使用CustomTextField的代碼,可放在viewDidLoad等方法中
????_textField?= [[CustomTextField?alloc]?initWithFrame:CGRectMake(20,?150,?280,?30)];
????_textField.placeholder?=?@"請(qǐng)輸入帳號(hào)信息";
????_textField.borderStyle?=?UITextBorderStyleRoundedRect;
????_textField.textAlignment?=?UITextAlignmentLeft;
????_textField.delegate?=?self;
????_textField.clearButtonMode?=?UITextFieldViewModeWhileEditing;
????_textField.text?=?@"aa";
????UIImageView?*imgv = [[UIImageView?alloc]?initWithImage:[UIImage?imageNamed:@"icon-iwant-2.png"]];
????_textField.leftView?= imgv;
????_textField.leftViewMode?=?UITextFieldViewModeAlways;
????[self.view?addSubview:_textField];
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