14.UITextField内容缩进/placeholder改变颜色

UITextField 里面的字体内容如何缩进?
如何修改 UITextField 的placeholder 的颜色呢?
1.也许你会想到在 textField的底层加一层 UIView, 其实有一个更简单的技巧,就是通过其自身属性leftView去控制内容缩进。

UITextField *putInTF = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 200, 35)];
putInTF.textAlignment = NSTextAlignmentLeft;
putInTF.backgroundColor = [UIColor greenColor];
putInTF.placeholder = @"请输入";
[self.view addSubview:putInTF];

UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 50, 0)];
leftView.backgroundColor = [UIColor whiteColor];
putInTF.leftView = leftView;
putInTF.leftViewMode = UITextFieldViewModeAlways;
.

leftViewMode
UITextFieldViewModeNever, 从不存在
UITextFieldViewModeWhileEditing, 编辑的时候存在
UITextFieldViewModeUnlessEditing, 非编辑的时候存在
UITextFieldViewModeAlways 一直存在
leftView添加前:

leftView添加后:

2.改变UITextField 的placeholder 颜色
其实通过NSAttributedString就可以来控制 placeholder 的颜色。

UITextField *putInTF = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 200, 35)];
putInTF.textAlignment = NSTextAlignmentLeft;
putInTF.backgroundColor = [UIColor greenColor];
[self.view addSubview:putInTF];

putInTF.attributedPlaceholder = [[NSAttributedString alloc] initWithString:@"请输入" attributes:@{NSForegroundColorAttributeName:[UIColor redColor]}];
.