如何將UIButton的標題設置爲左對齊？

我須要從UIButton左側顯示電子郵件地址，可是它位於中間。

有什麼辦法能夠將對齊方式設置到UIButton的左側？

這是我當前的代碼：

UIButton* emailBtn = [[UIButton alloc] initWithFrame:CGRectMake(5,30,250,height+15)];
emailBtn.backgroundColor = [UIColor clearColor];
[emailBtn setTitle:obj2.customerEmail forState:UIControlStateNormal];
emailBtn.titleLabel.font = [UIFont systemFontOfSize:12.5];
[emailBtn setTitleColor:[[[UIColor alloc]initWithRed:0.121 green:0.472 blue:0.823 alpha:1]autorelease] forState:UIControlStateNormal];
[emailBtn addTarget:self action:@selector(emailAction:) forControlEvents:UIControlEventTouchUpInside];
[elementView addSubview:emailBtn];
[emailBtn release];

---

#1樓

此處說明了如何執行操做以及其工做原理： http : //cocoathings.blogspot.com/2013/03/how-to-make-uibutton-text-left-or-right.html

---

#2樓

若是您不想更改按鈕內的整個內容位置，則使用emailBtn.titleEdgeInsets優於contentEdgeInsets 。

---

#3樓

若是您不想在代碼中進行調整，也可使用界面生成器。 在這裏，我使文本左對齊並縮進一些：

不要忘記，您也能夠在按鈕中對齊圖像。

---

#4樓

UIButton *btn;
btn.contentVerticalAlignment = UIControlContentVerticalAlignmentTop;
btn.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;

---

#5樓

設置contentHorizo​​ntalAlignment：

emailBtn.contentHorizontalAlignment = .left;

您可能還須要調整左插圖的內容，不然文本將觸摸左邊框：

emailBtn.contentEdgeInsets = UIEdgeInsetsMake(0, 10, 0, 0);

// Swift 3 and up:
emailBtn.contentEdgeInsets = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 0);